21142331479 has 2 divisors, whose sum is σ = 21142331480. Its totient is φ = 21142331478.

The previous prime is 21142331311. The next prime is 21142331513. The reversal of 21142331479 is 97413324112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21142331479 - 2²¹ = 21140234327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142331879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571165739 + 10571165740.

It is an arithmetic number, because the mean of its divisors is an integer number (10571165740).

Almost surely, 2^21142331479 is an apocalyptic number.

21142331479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142331479 is an equidigital number, since it uses as much as digits as its factorization.

21142331479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The spelling of 21142331479 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-one thousand, four hundred seventy-nine".