21036522 has 32 divisors (see below), whose sum is σ = 45517248. Its totient is φ = 6443136.

The previous prime is 21036517. The next prime is 21036527. The reversal of 21036522 is 22563012.

It is an interprime number because it is at equal distance from previous prime (21036517) and next prime (21036527).

It is not an unprimeable number, because it can be changed into a prime (21036527) 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, 21598 + ... + 22550.

It is an arithmetic number, because the mean of its divisors is an integer number (1422414).

Almost surely, 2^21036522 is an apocalyptic number.

21036522 is an abundant number, since it is smaller than the sum of its proper divisors (24480726).

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

21036522 is a wasteful number, since it uses less digits than its factorization.

21036522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21036522 is about 4586.5588407868. The cubic root of 21036522 is about 276.0522637846.

Adding to 21036522 its reverse (22563012), we get a palindrome (43599534).

The spelling of 21036522 in words is "twenty-one million, thirty-six thousand, five hundred twenty-two".