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BaseRepresentation
bin100100011010111…
…1100010000100001
310011011121010001000
41020311330100201
510000324200001
6321133502213
742166451523
oct11065742041
93134533030
101222100001
11577930901
122a1341969
131662616c5
14b8443a13
1572453a86
hex48d7c421

1222100001 has 8 divisors (see below), whose sum is σ = 1810518560. Its totient is φ = 814733316.

The previous prime is 1222099999. The next prime is 1222100017. The reversal of 1222100001 is 1000012221.

It is not a de Polignac number, because 1222100001 - 21 = 1222099999 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22631455 + ... + 22631508.

It is an arithmetic number, because the mean of its divisors is an integer number (226314820).

Almost surely, 21222100001 is an apocalyptic number.

It is an amenable number.

1222100001 is a deficient number, since it is larger than the sum of its proper divisors (588418559).

1222100001 is an equidigital number, since it uses as much as digits as its factorization.

1222100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45262972 (or 45262966 counting only the distinct ones).

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

The square root of 1222100001 is about 34958.5468948582. The cubic root of 1222100001 is about 1069.1424698318.

Adding to 1222100001 its reverse (1000012221), we get a palindrome (2222112222).

The spelling of 1222100001 in words is "one billion, two hundred twenty-two million, one hundred thousand, one".