21028662 has 24 divisors (see below), whose sum is σ = 46336680. Its totient is φ = 6890400.

The previous prime is 21028661. The next prime is 21028663. The reversal of 21028662 is 26682012.

It is an interprime number because it is at equal distance from previous prime (21028661) and next prime (21028663).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21028661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8839 + ... + 10962.

It is an arithmetic number, because the mean of its divisors is an integer number (1930695).

Almost surely, 2^21028662 is an apocalyptic number.

21028662 is an abundant number, since it is smaller than the sum of its proper divisors (25308018).

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

21028662 is a wasteful number, since it uses less digits than its factorization.

21028662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19868 (or 19865 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21028662 is about 4585.7019091956. The cubic root of 21028662 is about 276.0178784890.

The spelling of 21028662 in words is "twenty-one million, twenty-eight thousand, six hundred sixty-two".