21941634 has 64 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 6054720.

The previous prime is 21941581. The next prime is 21941651. The reversal of 21941634 is 43614912.

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, 91687 + ... + 91925.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^21941634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

21941634 is an abundant number, since it is smaller than the sum of its proper divisors (30313086).

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

21941634 is a wasteful number, since it uses less digits than its factorization.

21941634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375.

The product of its digits is 5184, while the sum is 30.

The square root of 21941634 is about 4684.1897912019. The cubic root of 21941634 is about 279.9559199316.

It can be divided in two parts, 2194 and 1634, that added together give a triangular number (3828 = T₈₇).

The spelling of 21941634 in words is "twenty-one million, nine hundred forty-one thousand, six hundred thirty-four".