21902100201 has 6 divisors (see below), whose sum is σ = 31636366970. Its totient is φ = 14601400128.

The previous prime is 21902100173. The next prime is 21902100257. The reversal of 21902100201 is 10200120912.

It can be written as a sum of positive squares in only one way, i.e., 21601944576 + 300155625 = 146976^2 + 17325^2 .

It is not a de Polignac number, because 21902100201 - 2¹⁴ = 21902083817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902100281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1216783336 + ... + 1216783353.

Almost surely, 2^21902100201 is an apocalyptic number.

It is an amenable number.

21902100201 is a deficient number, since it is larger than the sum of its proper divisors (9734266769).

21902100201 is a wasteful number, since it uses less digits than its factorization.

21902100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433566695 (or 2433566692 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21902100201 in words is "twenty-one billion, nine hundred two million, one hundred thousand, two hundred one".