21292785079 has 2 divisors, whose sum is σ = 21292785080. Its totient is φ = 21292785078.

The previous prime is 21292785067. The next prime is 21292785083. The reversal of 21292785079 is 97058729212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21292785079 - 2⁵ = 21292785047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21292780079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646392539 + 10646392540.

It is an arithmetic number, because the mean of its divisors is an integer number (10646392540).

Almost surely, 2^21292785079 is an apocalyptic number.

21292785079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21292785079 is an equidigital number, since it uses as much as digits as its factorization.

21292785079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 21292785079 in words is "twenty-one billion, two hundred ninety-two million, seven hundred eighty-five thousand, seventy-nine".