21510052016 has 10 divisors (see below), whose sum is σ = 41675725812. Its totient is φ = 10755026000.

The previous prime is 21510052001. The next prime is 21510052049. The reversal of 21510052016 is 61025001512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21510051982 and 21510052000.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672189110 + ... + 672189141.

Almost surely, 2^21510052016 is an apocalyptic number.

It is an amenable number.

21510052016 is a deficient number, since it is larger than the sum of its proper divisors (20165673796).

21510052016 is a wasteful number, since it uses less digits than its factorization.

21510052016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344378259 (or 1344378253 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21510052016 its reverse (61025001512), we get a palindrome (82535053528).

The spelling of 21510052016 in words is "twenty-one billion, five hundred ten million, fifty-two thousand, sixteen".