21531202 has 16 divisors (see below), whose sum is σ = 40266432. Its totient is φ = 8388720.

The previous prime is 21531193. The next prime is 21531233. The reversal of 21531202 is 20213512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69753 + ... + 70060.

It is an arithmetic number, because the mean of its divisors is an integer number (2516652).

Almost surely, 2^21531202 is an apocalyptic number.

21531202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21531202 is a deficient number, since it is larger than the sum of its proper divisors (18735230).

21531202 is a wasteful number, since it uses less digits than its factorization.

21531202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139833.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21531202 is about 4640.1726260992. The cubic root of 21531202 is about 278.1993377355.

Adding to 21531202 its reverse (20213512), we get a palindrome (41744714).

The spelling of 21531202 in words is "twenty-one million, five hundred thirty-one thousand, two hundred two".