21137782799 has 8 divisors (see below), whose sum is σ = 24810370848. Its totient is φ = 17628420960.

The previous prime is 21137782781. The next prime is 21137782819. The reversal of 21137782799 is 99728773112.

It is a happy number.

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 21137782799 - 2²⁴ = 21121005583 is a prime.

It is a super-3 number, since 3×21137782799³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137782709) 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, 40806272 + ... + 40806789.

It is an arithmetic number, because the mean of its divisors is an integer number (3101296356).

Almost surely, 2^21137782799 is an apocalyptic number.

21137782799 is a deficient number, since it is larger than the sum of its proper divisors (3672588049).

21137782799 is an equidigital number, since it uses as much as digits as its factorization.

21137782799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81613105.

The product of its digits is 2667168, while the sum is 56.

The spelling of 21137782799 in words is "twenty-one billion, one hundred thirty-seven million, seven hundred eighty-two thousand, seven hundred ninety-nine".