21901000190 has 32 divisors (see below), whose sum is σ = 40081452480. Its totient is φ = 8613907200.

The previous prime is 21901000189. The next prime is 21901000243. The reversal of 21901000190 is 9100010912.

It is a super-2 number, since 2×21901000190² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3467135 + ... + 3473445.

It is an arithmetic number, because the mean of its divisors is an integer number (1252545390).

Almost surely, 2^21901000190 is an apocalyptic number.

21901000190 is a deficient number, since it is larger than the sum of its proper divisors (18180452290).

21901000190 is a wasteful number, since it uses less digits than its factorization.

21901000190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12068.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 21901000190 in words is "twenty-one billion, nine hundred one million, one hundred ninety", and thus it is an aban number.