21032572 has 24 divisors (see below), whose sum is σ = 40325040. Its totient is φ = 9519360.

The previous prime is 21032567. The next prime is 21032579. The reversal of 21032572 is 27523012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032579) 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 7 ways as a sum of consecutive naturals, for example, 10948 + ... + 12724.

It is an arithmetic number, because the mean of its divisors is an integer number (1680210).

Almost surely, 2^21032572 is an apocalyptic number.

21032572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21032572 is a deficient number, since it is larger than the sum of its proper divisors (19292468).

21032572 is a wasteful number, since it uses less digits than its factorization.

21032572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21032572 is about 4586.1282145182. The cubic root of 21032572 is about 276.0349847132.

Adding to 21032572 its reverse (27523012), we get a palindrome (48555584).

The spelling of 21032572 in words is "twenty-one million, thirty-two thousand, five hundred seventy-two".