21352312 has 16 divisors (see below), whose sum is σ = 40425840. Its totient is φ = 10572096.

The previous prime is 21352291. The next prime is 21352343. The reversal of 21352312 is 21325312.

It is a self number, because there is not a number n which added to its sum of digits gives 21352312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12133 + ... + 13780.

It is an arithmetic number, because the mean of its divisors is an integer number (2526615).

Almost surely, 2^21352312 is an apocalyptic number.

It is an amenable number.

21352312 is a deficient number, since it is larger than the sum of its proper divisors (19073528).

21352312 is a wasteful number, since it uses less digits than its factorization.

21352312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26022 (or 26018 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 21352312 is about 4620.8561977192. The cubic root of 21352312 is about 277.4267295666.

Adding to 21352312 its reverse (21325312), we get a palindrome (42677624).

Subtracting from 21352312 its reverse (21325312), we obtain a cube (27000 = 30³).

It can be divided in two parts, 213 and 52312, that added together give a palindrome (52525).

The spelling of 21352312 in words is "twenty-one million, three hundred fifty-two thousand, three hundred twelve".