21386852 has 6 divisors (see below), whose sum is σ = 37426998. Its totient is φ = 10693424.

The previous prime is 21386821. The next prime is 21386857. The reversal of 21386852 is 25868312.

It can be written as a sum of positive squares in only one way, i.e., 21381376 + 5476 = 4624^2 + 74^2 .

It is not an unprimeable number, because it can be changed into a prime (21386857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2673353 + ... + 2673360.

It is an arithmetic number, because the mean of its divisors is an integer number (6237833).

Almost surely, 2^21386852 is an apocalyptic number.

It is an amenable number.

21386852 is a deficient number, since it is larger than the sum of its proper divisors (16040146).

21386852 is a wasteful number, since it uses less digits than its factorization.

21386852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5346717 (or 5346715 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 21386852 is about 4624.5920901199. The cubic root of 21386852 is about 277.5762396371.

The spelling of 21386852 in words is "twenty-one million, three hundred eighty-six thousand, eight hundred fifty-two".