21051352 has 32 divisors (see below), whose sum is σ = 45400320. Its totient is φ = 8964000.

The previous prime is 21051343. The next prime is 21051353. The reversal of 21051352 is 25315012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8227 + ... + 10477.

It is an arithmetic number, because the mean of its divisors is an integer number (1418760).

Almost surely, 2^21051352 is an apocalyptic number.

It is an amenable number.

21051352 is an abundant number, since it is smaller than the sum of its proper divisors (24348968).

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

21051352 is a wasteful number, since it uses less digits than its factorization.

21051352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431 (or 2427 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21051352 is about 4588.1752364094. The cubic root of 21051352 is about 276.1171175572.

Adding to 21051352 its reverse (25315012), we get a palindrome (46366364).

The spelling of 21051352 in words is "twenty-one million, fifty-one thousand, three hundred fifty-two".