21274776731 has 8 divisors (see below), whose sum is σ = 22912459584. Its totient is φ = 19637259840.

The previous prime is 21274776671. The next prime is 21274776737. The reversal of 21274776731 is 13767747212.

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 21274776731 - 2¹⁰ = 21274775707 is a prime.

It is a super-2 number, since 2×21274776731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21274776737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394526 + ... + 445196.

It is an arithmetic number, because the mean of its divisors is an integer number (2864057448).

Almost surely, 2^21274776731 is an apocalyptic number.

21274776731 is a deficient number, since it is larger than the sum of its proper divisors (1637682853).

21274776731 is a wasteful number, since it uses less digits than its factorization.

21274776731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82981.

The product of its digits is 691488, while the sum is 47.

The spelling of 21274776731 in words is "twenty-one billion, two hundred seventy-four million, seven hundred seventy-six thousand, seven hundred thirty-one".