21715052 has 12 divisors (see below), whose sum is σ = 40236840. Its totient is φ = 10218816.

The previous prime is 21715049. The next prime is 21715061. The reversal of 21715052 is 25051712.

It is a happy 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, 159602 + ... + 159737.

It is an arithmetic number, because the mean of its divisors is an integer number (3353070).

Almost surely, 2^21715052 is an apocalyptic number.

It is an amenable number.

21715052 is a deficient number, since it is larger than the sum of its proper divisors (18521788).

21715052 is a wasteful number, since it uses less digits than its factorization.

21715052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319360 (or 319358 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 21715052 is about 4659.9412013458. The cubic root of 21715052 is about 278.9889214222.

Adding to 21715052 its reverse (25051712), we get a palindrome (46766764).

The spelling of 21715052 in words is "twenty-one million, seven hundred fifteen thousand, fifty-two".