21145792799 has 2 divisors, whose sum is σ = 21145792800. Its totient is φ = 21145792798.

The previous prime is 21145792769. The next prime is 21145792823. The reversal of 21145792799 is 99729754112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21145792799 - 2³² = 16850825503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145792709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572896399 + 10572896400.

It is an arithmetic number, because the mean of its divisors is an integer number (10572896400).

Almost surely, 2^21145792799 is an apocalyptic number.

21145792799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145792799 is an equidigital number, since it uses as much as digits as its factorization.

21145792799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 56.

The spelling of 21145792799 in words is "twenty-one billion, one hundred forty-five million, seven hundred ninety-two thousand, seven hundred ninety-nine".