21910129185 has 16 divisors (see below), whose sum is σ = 40064236416. Its totient is φ = 10016059008.

The previous prime is 21910129127. The next prime is 21910129229. The reversal of 21910129185 is 58192101912.

It is a happy number.

It is not a de Polignac number, because 21910129185 - 2⁶ = 21910129121 is a prime.

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, 104333844 + ... + 104334053.

It is an arithmetic number, because the mean of its divisors is an integer number (2504014776).

Almost surely, 2^21910129185 is an apocalyptic number.

It is an amenable number.

21910129185 is a deficient number, since it is larger than the sum of its proper divisors (18154107231).

21910129185 is a wasteful number, since it uses less digits than its factorization.

21910129185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208667912.

The product of its (nonzero) digits is 12960, while the sum is 39.

The spelling of 21910129185 in words is "twenty-one billion, nine hundred ten million, one hundred twenty-nine thousand, one hundred eighty-five".