21609740131 has 8 divisors (see below), whose sum is σ = 24777294080. Its totient is φ = 18462298248.

The previous prime is 21609740099. The next prime is 21609740143. The reversal of 21609740131 is 13104790612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21609740131 - 2⁵ = 21609740099 is a prime.

It is a super-2 number, since 2×21609740131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21609740531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5025711 + ... + 5030008.

It is an arithmetic number, because the mean of its divisors is an integer number (3097161760).

Almost surely, 2^21609740131 is an apocalyptic number.

21609740131 is a deficient number, since it is larger than the sum of its proper divisors (3167553949).

21609740131 is a wasteful number, since it uses less digits than its factorization.

21609740131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056033.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 21609740131 in words is "twenty-one billion, six hundred nine million, seven hundred forty thousand, one hundred thirty-one".