21015052 has 6 divisors (see below), whose sum is σ = 36776348. Its totient is φ = 10507524.

The previous prime is 21015047. The next prime is 21015061. The reversal of 21015052 is 25051012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626878 + ... + 2626885.

Almost surely, 2^21015052 is an apocalyptic number.

It is an amenable number.

21015052 is a deficient number, since it is larger than the sum of its proper divisors (15761296).

21015052 is a wasteful number, since it uses less digits than its factorization.

21015052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253767 (or 5253765 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 21015052 is about 4584.2177086173. The cubic root of 21015052 is about 275.9583182872.

Adding to 21015052 its reverse (25051012), we get a palindrome (46066064).

The spelling of 21015052 in words is "twenty-one million, fifteen thousand, fifty-two".