16977182021 has 2 divisors, whose sum is σ = 16977182022. Its totient is φ = 16977182020.

The previous prime is 16977181957. The next prime is 16977182063. The reversal of 16977182021 is 12028177961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13511505121 + 3465676900 = 116239^2 + 58870^2 .

It is a cyclic number.

It is not a de Polignac number, because 16977182021 - 2⁶ = 16977181957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16977188021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488591010 + 8488591011.

It is an arithmetic number, because the mean of its divisors is an integer number (8488591011).

Almost surely, 2^16977182021 is an apocalyptic number.

It is an amenable number.

16977182021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16977182021 is an equidigital number, since it uses as much as digits as its factorization.

16977182021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 16977182021 in words is "sixteen billion, nine hundred seventy-seven million, one hundred eighty-two thousand, twenty-one".