21134624 has 24 divisors (see below), whose sum is σ = 47553408. Its totient is φ = 9057600.

The previous prime is 21134611. The next prime is 21134657. The reversal of 21134624 is 42643112.

It is a self number, because there is not a number n which added to its sum of digits gives 21134624.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46952 + ... + 47399.

It is an arithmetic number, because the mean of its divisors is an integer number (1981392).

Almost surely, 2^21134624 is an apocalyptic number.

It is an amenable number.

21134624 is an abundant number, since it is smaller than the sum of its proper divisors (26418784).

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

21134624 is an equidigital number, since it uses as much as digits as its factorization.

21134624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94368 (or 94360 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 21134624 is about 4597.2409116774. The cubic root of 21134624 is about 276.4807137417.

Adding to 21134624 its reverse (42643112), we get a palindrome (63777736).

The spelling of 21134624 in words is "twenty-one million, one hundred thirty-four thousand, six hundred twenty-four".