21510052010 has 32 divisors (see below), whose sum is σ = 38928460032. Its totient is φ = 8557381120.

The previous prime is 21510052001. The next prime is 21510052049. The reversal of 21510052010 is 1025001512.

It is a self number, because there is not a number n which added to its sum of digits gives 21510052010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695290 + ... + 1707930.

It is an arithmetic number, because the mean of its divisors is an integer number (1216514376).

Almost surely, 2^21510052010 is an apocalyptic number.

21510052010 is a deficient number, since it is larger than the sum of its proper divisors (17418408022).

21510052010 is a wasteful number, since it uses less digits than its factorization.

21510052010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13558.

The product of its (nonzero) digits is 100, while the sum is 17.

Adding to 21510052010 its reverse (1025001512), we get a palindrome (22535053522).

The spelling of 21510052010 in words is "twenty-one billion, five hundred ten million, fifty-two thousand, ten".