21349752 has 32 divisors (see below), whose sum is σ = 53526480. Its totient is φ = 7096320.

The previous prime is 21349733. The next prime is 21349759. The reversal of 21349752 is 25794312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349759) 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, 9048 + ... + 11160.

Almost surely, 2^21349752 is an apocalyptic number.

It is an amenable number.

21349752 is an abundant number, since it is smaller than the sum of its proper divisors (32176728).

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

21349752 is a wasteful number, since it uses less digits than its factorization.

21349752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543 (or 2539 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 21349752 is about 4620.5791844746. The cubic root of 21349752 is about 277.4156419178.

The spelling of 21349752 in words is "twenty-one million, three hundred forty-nine thousand, seven hundred fifty-two".