21349624 has 16 divisors (see below), whose sum is σ = 40154400. Its totient is φ = 10641792.

The previous prime is 21349621. The next prime is 21349661. The reversal of 21349624 is 42694312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264 + ... + 6655.

It is an arithmetic number, because the mean of its divisors is an integer number (2509650).

Almost surely, 2^21349624 is an apocalyptic number.

It is an amenable number.

21349624 is a deficient number, since it is larger than the sum of its proper divisors (18804776).

21349624 is a wasteful number, since it uses less digits than its factorization.

21349624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262 (or 8258 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 21349624 is about 4620.5653333764. The cubic root of 21349624 is about 277.4150875121.

The spelling of 21349624 in words is "twenty-one million, three hundred forty-nine thousand, six hundred twenty-four".