21362788 has 12 divisors (see below), whose sum is σ = 37437372. Its totient is φ = 10666400.

The previous prime is 21362753. The next prime is 21362827. The reversal of 21362788 is 88726312.

It can be written as a sum of positive squares in 2 ways, for example, as 9474084 + 11888704 = 3078^2 + 3448^2 .

It is a super-2 number, since 2×21362788² = 912737422265888, which contains 22 as substring.

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, 163 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (3119781).

Almost surely, 2^21362788 is an apocalyptic number.

It is an amenable number.

21362788 is a deficient number, since it is larger than the sum of its proper divisors (16074584).

21362788 is a wasteful number, since it uses less digits than its factorization.

21362788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502 (or 7500 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 21362788 is about 4621.9896148737. The cubic root of 21362788 is about 277.4720930733.

It can be divided in two parts, 213 and 62788, that added together give a square (63001 = 251²).

The spelling of 21362788 in words is "twenty-one million, three hundred sixty-two thousand, seven hundred eighty-eight".