11721605021610 has 64 divisors (see below), whose sum is σ = 30709106812800. Its totient is φ = 2839766618880.

The previous prime is 11721605021573. The next prime is 11721605021657. The reversal of 11721605021610 is 1612050612711.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

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, 10954297 + ... + 11976636.

It is an arithmetic number, because the mean of its divisors is an integer number (479829793950).

Almost surely, 2^{11721605021610} is an apocalyptic number.

11721605021610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721605021610 is an abundant number, since it is smaller than the sum of its proper divisors (18987501791190).

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

11721605021610 is a wasteful number, since it uses less digits than its factorization.

11721605021610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22932503.

The product of its (nonzero) digits is 5040, while the sum is 33.

The spelling of 11721605021610 in words is "eleven trillion, seven hundred twenty-one billion, six hundred five million, twenty-one thousand, six hundred ten".