21910135 has 32 divisors (see below), whose sum is σ = 30260160. Its totient is φ = 15095808.

The previous prime is 21910123. The next prime is 21910157. The reversal of 21910135 is 53101912.

It is not a de Polignac number, because 21910135 - 2¹⁷ = 21779063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139477 + ... + 139633.

It is an arithmetic number, because the mean of its divisors is an integer number (945630).

Almost surely, 2^21910135 is an apocalyptic number.

21910135 is a deficient number, since it is larger than the sum of its proper divisors (8350025).

21910135 is a wasteful number, since it uses less digits than its factorization.

21910135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 21910135 is about 4680.8263159404. The cubic root of 21910135 is about 279.8218892771.

The spelling of 21910135 in words is "twenty-one million, nine hundred ten thousand, one hundred thirty-five".