21319752 has 16 divisors (see below), whose sum is σ = 53299440. Its totient is φ = 7106576.

The previous prime is 21319747. The next prime is 21319757. The reversal of 21319752 is 25791312.

It is an interprime number because it is at equal distance from previous prime (21319747) and next prime (21319757).

It is not an unprimeable number, because it can be changed into a prime (21319757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444138 + ... + 444185.

It is an arithmetic number, because the mean of its divisors is an integer number (3331215).

Almost surely, 2^21319752 is an apocalyptic number.

It is an amenable number.

21319752 is an abundant number, since it is smaller than the sum of its proper divisors (31979688).

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

21319752 is a wasteful number, since it uses less digits than its factorization.

21319752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888332 (or 888328 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 21319752 is about 4617.3316969869. The cubic root of 21319752 is about 277.2856424302.

The spelling of 21319752 in words is "twenty-one million, three hundred nineteen thousand, seven hundred fifty-two".