16466631021 has 20 divisors (see below), whose sum is σ = 24608252064. Its totient is φ = 10973313000.

The previous prime is 16466631011. The next prime is 16466631053. The reversal of 16466631021 is 12013666461.

It is a happy number.

It is not a de Polignac number, because 16466631021 - 2⁷ = 16466630893 is a prime.

It is a super-2 number, since 2×16466631021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16466631011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 166786 + ... + 246476.

Almost surely, 2^16466631021 is an apocalyptic number.

It is an amenable number.

16466631021 is a deficient number, since it is larger than the sum of its proper divisors (8141621043).

16466631021 is an equidigital number, since it uses as much as digits as its factorization.

16466631021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82254 (or 82245 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 16466631021 in words is "sixteen billion, four hundred sixty-six million, six hundred thirty-one thousand, twenty-one".