10221766731 has 30 divisors (see below), whose sum is σ = 16783904676. Its totient is φ = 6195004200.

The previous prime is 10221766691. The next prime is 10221766733. The reversal of 10221766731 is 13766712201.

It is a happy number.

It is not a de Polignac number, because 10221766731 - 2¹⁰ = 10221765707 is a prime.

It is a super-2 number, since 2×10221766731² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (10221766733) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 511665 + ... + 531266.

Almost surely, 2^10221766731 is an apocalyptic number.

10221766731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10221766731 is a deficient number, since it is larger than the sum of its proper divisors (6562137945).

10221766731 is a wasteful number, since it uses less digits than its factorization.

10221766731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042965 (or 1042945 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 10221766731 in words is "ten billion, two hundred twenty-one million, seven hundred sixty-six thousand, seven hundred thirty-one".