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1220210001 = 34191734583
BaseRepresentation
bin100100010111010…
…1110110101010001
310011001001002110000
41020232232311101
54444333210001
6321025200213
742144420363
oct11056566521
93131032400
101220210001
1157685a91a
122a0790069
13165a4c36a
14b80b0d33
15721cda86
hex48baed51

1220210001 has 40 divisors (see below), whose sum is σ = 1930230720. Its totient is φ = 766037088.

The previous prime is 1220209999. The next prime is 1220210009. The reversal of 1220210001 is 1000120221.

It is not a de Polignac number, because 1220210001 - 21 = 1220209999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1220210009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 263956 + ... + 268538.

It is an arithmetic number, because the mean of its divisors is an integer number (48255768).

Almost surely, 21220210001 is an apocalyptic number.

It is an amenable number.

1220210001 is a deficient number, since it is larger than the sum of its proper divisors (710020719).

1220210001 is a wasteful number, since it uses less digits than its factorization.

1220210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787 (or 4778 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1220210001 is about 34931.5044193633. The cubic root of 1220210001 is about 1068.5910360063.

Adding to 1220210001 its reverse (1000120221), we get a palindrome (2220330222).

The spelling of 1220210001 in words is "one billion, two hundred twenty million, two hundred ten thousand, one".

Divisors: 1 3 9 19 27 57 81 171 173 513 519 1539 1557 3287 4583 4671 9861 13749 14013 29583 41247 87077 88749 123741 261231 266247 371223 783693 792859 2351079 2378577 7053237 7135731 15064321 21407193 45192963 64221579 135578889 406736667 1220210001