821145605610 has 64 divisors (see below), whose sum is σ = 2166837018624. Its totient is φ = 197498145600.

The previous prime is 821145605557. The next prime is 821145605629. The reversal of 821145605610 is 16506541128.

It is a super-2 number, since 2×821145605610² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9754626 + ... + 9838445.

It is an arithmetic number, because the mean of its divisors is an integer number (33856828416).

Almost surely, 2^821145605610 is an apocalyptic number.

821145605610 is an abundant number, since it is smaller than the sum of its proper divisors (1345691413014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821145605610 is a wasteful number, since it uses less digits than its factorization.

821145605610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19593219.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 821145605610 in words is "eight hundred twenty-one billion, one hundred forty-five million, six hundred five thousand, six hundred ten".