21246522 has 32 divisors (see below), whose sum is σ = 48798720. Its totient is φ = 6099120.

The previous prime is 21246521. The next prime is 21246529. The reversal of 21246522 is 22564212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21246492 and 21246501.

It is not an unprimeable number, because it can be changed into a prime (21246521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7218 + ... + 9725.

It is an arithmetic number, because the mean of its divisors is an integer number (1524960).

Almost surely, 2^21246522 is an apocalyptic number.

21246522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21246522 is an abundant number, since it is smaller than the sum of its proper divisors (27552198).

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

21246522 is a wasteful number, since it uses less digits than its factorization.

21246522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16978.

The product of its digits is 1920, while the sum is 24.

The square root of 21246522 is about 4609.3949711432. The cubic root of 21246522 is about 276.9678006945.

It can be divided in two parts, 2124 and 6522, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 21246522 in words is "twenty-one million, two hundred forty-six thousand, five hundred twenty-two".