16961036821 has 2 divisors, whose sum is σ = 16961036822. Its totient is φ = 16961036820.

The previous prime is 16961036767. The next prime is 16961036861. The reversal of 16961036821 is 12863016961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13528248721 + 3432788100 = 116311^2 + 58590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16961036821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16961036861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8480518410 + 8480518411.

It is an arithmetic number, because the mean of its divisors is an integer number (8480518411).

Almost surely, 2^16961036821 is an apocalyptic number.

It is an amenable number.

16961036821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16961036821 is an equidigital number, since it uses as much as digits as its factorization.

16961036821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 16961036821 in words is "sixteen billion, nine hundred sixty-one million, thirty-six thousand, eight hundred twenty-one".