21901134 has 32 divisors (see below), whose sum is σ = 47519136. Its totient is φ = 6702080.

The previous prime is 21901133. The next prime is 21901141. The reversal of 21901134 is 43110912.

It is a self number, because there is not a number n which added to its sum of digits gives 21901134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1564 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (1484973).

Almost surely, 2^21901134 is an apocalyptic number.

21901134 is an abundant number, since it is smaller than the sum of its proper divisors (25618002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21901134 is a wasteful number, since it uses less digits than its factorization.

21901134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21901134 is about 4679.8647416352. The cubic root of 21901134 is about 279.7835657371.

The spelling of 21901134 in words is "twenty-one million, nine hundred one thousand, one hundred thirty-four".