21293773099 has 2 divisors, whose sum is σ = 21293773100. Its totient is φ = 21293773098.

The previous prime is 21293773069. The next prime is 21293773169. The reversal of 21293773099 is 99037739212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21293773099 - 2²¹ = 21291675947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21293773019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646886549 + 10646886550.

It is an arithmetic number, because the mean of its divisors is an integer number (10646886550).

Almost surely, 2^21293773099 is an apocalyptic number.

21293773099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21293773099 is an equidigital number, since it uses as much as digits as its factorization.

21293773099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1285956, while the sum is 52.

The spelling of 21293773099 in words is "twenty-one billion, two hundred ninety-three million, seven hundred seventy-three thousand, ninety-nine".