21512013010 has 64 divisors (see below), whose sum is σ = 42126013440. Its totient is φ = 7878942720.

The previous prime is 21512013001. The next prime is 21512013013. The reversal of 21512013010 is 1031021512.

It is not an unprimeable number, because it can be changed into a prime (21512013013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 961855 + ... + 983965.

It is an arithmetic number, because the mean of its divisors is an integer number (658218960).

Almost surely, 2^21512013010 is an apocalyptic number.

21512013010 is a deficient number, since it is larger than the sum of its proper divisors (20614000430).

21512013010 is a wasteful number, since it uses less digits than its factorization.

21512013010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22291.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21512013010 its reverse (1031021512), we get a palindrome (22543034522).

The spelling of 21512013010 in words is "twenty-one billion, five hundred twelve million, thirteen thousand, ten".