21161004001399 has 2 divisors, whose sum is σ = 21161004001400. Its totient is φ = 21161004001398.

The previous prime is 21161004001391. The next prime is 21161004001411. The reversal of 21161004001399 is 99310040016112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21161004001399 - 2³ = 21161004001391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21161004001391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580502000699 + 10580502000700.

It is an arithmetic number, because the mean of its divisors is an integer number (10580502000700).

Almost surely, 2^{21161004001399} is an apocalyptic number.

21161004001399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21161004001399 is an equidigital number, since it uses as much as digits as its factorization.

21161004001399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 21161004001399 in words is "twenty-one trillion, one hundred sixty-one billion, four million, one thousand, three hundred ninety-nine".