21032810 has 32 divisors (see below), whose sum is σ = 41592960. Its totient is φ = 7622208.

The previous prime is 21032807. The next prime is 21032813. The reversal of 21032810 is 1823012.

It is an interprime number because it is at equal distance from previous prime (21032807) and next prime (21032813).

It is a super-2 number, since 2×21032810² = 884758192992200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21032813) 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 15 ways as a sum of consecutive naturals, for example, 1964 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1299780).

Almost surely, 2^21032810 is an apocalyptic number.

21032810 is a deficient number, since it is larger than the sum of its proper divisors (20560150).

21032810 is a wasteful number, since it uses less digits than its factorization.

21032810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21032810 is about 4586.1541622584. The cubic root of 21032810 is about 276.0360258932.

Adding to 21032810 its reverse (1823012), we get a palindrome (22855822).

It can be divided in two parts, 2103 and 2810, that added together give a cube (4913 = 17³).

The spelling of 21032810 in words is "twenty-one million, thirty-two thousand, eight hundred ten".