21611571060 has 24 divisors (see below), whose sum is σ = 60512399136. Its totient is φ = 5763085600.

The previous prime is 21611571053. The next prime is 21611571073. The reversal of 21611571060 is 6017511612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180096366 + ... + 180096485.

It is an arithmetic number, because the mean of its divisors is an integer number (2521349964).

Almost surely, 2^21611571060 is an apocalyptic number.

21611571060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21611571060 is an abundant number, since it is smaller than the sum of its proper divisors (38900828076).

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

21611571060 is a wasteful number, since it uses less digits than its factorization.

21611571060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360192863 (or 360192861 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 21611571060 in words is "twenty-one billion, six hundred eleven million, five hundred seventy-one thousand, sixty".