21537760641 has 8 divisors (see below), whose sum is σ = 29110398240. Its totient is φ = 14161815072.

The previous prime is 21537760627. The next prime is 21537760667. The reversal of 21537760641 is 14606773512.

It is a happy number.

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

It is not a de Polignac number, because 21537760641 - 2⁶ = 21537760577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21537760593 and 21537760602.

It is not an unprimeable number, because it can be changed into a prime (21537760691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49172751 + ... + 49173188.

It is an arithmetic number, because the mean of its divisors is an integer number (3638799780).

Almost surely, 2^21537760641 is an apocalyptic number.

It is an amenable number.

21537760641 is a deficient number, since it is larger than the sum of its proper divisors (7572637599).

21537760641 is an equidigital number, since it uses as much as digits as its factorization.

21537760641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98346015.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 21537760641 in words is "twenty-one billion, five hundred thirty-seven million, seven hundred sixty thousand, six hundred forty-one".