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21200221021 = 73028603003
BaseRepresentation
bin10011101111101000…
…011011001101011101
32000201110221210222011
4103233220123031131
5321404224033041
613423402151221
71350234622360
oct235750331535
960643853864
1021200221021
118a99a76921
124137ab2511
131ccb2488a5
1410518720d7
158412ebe81
hex4efa1b35d

21200221021 has 4 divisors (see below), whose sum is σ = 24228824032. Its totient is φ = 18171618012.

The previous prime is 21200220959. The next prime is 21200221037. The reversal of 21200221021 is 12012200212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200221021 - 219 = 21199696733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200220992 and 21200221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514301495 + ... + 1514301508.

It is an arithmetic number, because the mean of its divisors is an integer number (6057206008).

Almost surely, 221200221021 is an apocalyptic number.

It is an amenable number.

21200221021 is a deficient number, since it is larger than the sum of its proper divisors (3028603011).

21200221021 is an equidigital number, since it uses as much as digits as its factorization.

21200221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028603010.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200221021 its reverse (12012200212), we get a palindrome (33212421233).

The spelling of 21200221021 in words is "twenty-one billion, two hundred million, two hundred twenty-one thousand, twenty-one".

Divisors: 1 7 3028603003 21200221021