21064450 has 24 divisors (see below), whose sum is σ = 42742800. Its totient is φ = 7659600.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064450 is 5446012.

It is a super-2 number, since 2×21064450² = 887422107605000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18600 + ... + 19699.

It is an arithmetic number, because the mean of its divisors is an integer number (1780950).

Almost surely, 2^21064450 is an apocalyptic number.

21064450 is an abundant number, since it is smaller than the sum of its proper divisors (21678350).

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

21064450 is a wasteful number, since it uses less digits than its factorization.

21064450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38322 (or 38317 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21064450 is about 4589.6023792917. The cubic root of 21064450 is about 276.1743717135.

It can be divided in two parts, 2106 and 4450, that added together give a palindrome (6556).

The spelling of 21064450 in words is "twenty-one million, sixty-four thousand, four hundred fifty".