21515512271210 has 64 divisors (see below), whose sum is σ = 40872099536640. Its totient is φ = 8138274608640.

The previous prime is 21515512271191. The next prime is 21515512271269. The reversal of 21515512271210 is 1217221551512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138729569 + ... + 138884571.

It is an arithmetic number, because the mean of its divisors is an integer number (638626555260).

Almost surely, 2^{21515512271210} is an apocalyptic number.

21515512271210 is a deficient number, since it is larger than the sum of its proper divisors (19356587265430).

21515512271210 is a wasteful number, since it uses less digits than its factorization.

21515512271210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161903.

The product of its (nonzero) digits is 14000, while the sum is 35.

The spelling of 21515512271210 in words is "twenty-one trillion, five hundred fifteen billion, five hundred twelve million, two hundred seventy-one thousand, two hundred ten".