21195534 has 16 divisors (see below), whose sum is σ = 42497280. Its totient is φ = 7047480.

The previous prime is 21195533. The next prime is 21195541. The reversal of 21195534 is 43559112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21195533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1702 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (2656080).

Almost surely, 2^21195534 is an apocalyptic number.

21195534 is an abundant number, since it is smaller than the sum of its proper divisors (21301746).

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

21195534 is a wasteful number, since it uses less digits than its factorization.

21195534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855.

The product of its digits is 5400, while the sum is 30.

The square root of 21195534 is about 4603.8607711355. The cubic root of 21195534 is about 276.7460648558.

The spelling of 21195534 in words is "twenty-one million, one hundred ninety-five thousand, five hundred thirty-four".