16942535021 has 2 divisors, whose sum is σ = 16942535022. Its totient is φ = 16942535020.

The previous prime is 16942534991. The next prime is 16942535081. The reversal of 16942535021 is 12053524961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13319698921 + 3622836100 = 115411^2 + 60190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16942535021 is a prime.

It is a super-2 number, since 2×16942535021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16942535081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8471267510 + 8471267511.

It is an arithmetic number, because the mean of its divisors is an integer number (8471267511).

Almost surely, 2^16942535021 is an apocalyptic number.

It is an amenable number.

16942535021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16942535021 is an equidigital number, since it uses as much as digits as its factorization.

16942535021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 16942535021 in words is "sixteen billion, nine hundred forty-two million, five hundred thirty-five thousand, twenty-one".