21021364 has 24 divisors (see below), whose sum is σ = 45277568. Its totient is φ = 8316000.

The previous prime is 21021359. The next prime is 21021383. The reversal of 21021364 is 46312012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28512 + ... + 29239.

Almost surely, 2^21021364 is an apocalyptic number.

It is an amenable number.

21021364 is an abundant number, since it is smaller than the sum of its proper divisors (24256204).

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

21021364 is a wasteful number, since it uses less digits than its factorization.

21021364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57775 (or 57773 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21021364 is about 4584.9061059088. The cubic root of 21021364 is about 275.9859441137.

Adding to 21021364 its reverse (46312012), we get a palindrome (67333376).

The spelling of 21021364 in words is "twenty-one million, twenty-one thousand, three hundred sixty-four".