21502532 has 12 divisors (see below), whose sum is σ = 38547516. Its totient is φ = 10488960.

The previous prime is 21502531. The next prime is 21502571. The reversal of 21502532 is 23520512.

It can be written as a sum of positive squares in 2 ways, for example, as 2353156 + 19149376 = 1534^2 + 4376^2 .

It is a super-2 number, since 2×21502532² = 924717764822048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21502531) 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, 65393 + ... + 65720.

It is an arithmetic number, because the mean of its divisors is an integer number (3212293).

Almost surely, 2^21502532 is an apocalyptic number.

It is an amenable number.

21502532 is a deficient number, since it is larger than the sum of its proper divisors (17044984).

21502532 is a wasteful number, since it uses less digits than its factorization.

21502532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131158 (or 131156 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21502532 is about 4637.0822722915. The cubic root of 21502532 is about 278.0758035611.

The spelling of 21502532 in words is "twenty-one million, five hundred two thousand, five hundred thirty-two".