21039052 has 6 divisors (see below), whose sum is σ = 36818348. Its totient is φ = 10519524.

The previous prime is 21039001. The next prime is 21039079. The reversal of 21039052 is 25093012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629878 + ... + 2629885.

Almost surely, 2^21039052 is an apocalyptic number.

It is an amenable number.

21039052 is a deficient number, since it is larger than the sum of its proper divisors (15779296).

21039052 is a wasteful number, since it uses less digits than its factorization.

21039052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259767 (or 5259765 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21039052 is about 4586.8346383972. The cubic root of 21039052 is about 276.0633300029.

The spelling of 21039052 in words is "twenty-one million, thirty-nine thousand, fifty-two".