21202145479 has 2 divisors, whose sum is σ = 21202145480. Its totient is φ = 21202145478.

The previous prime is 21202145431. The next prime is 21202145491. The reversal of 21202145479 is 97454120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202145479 - 2⁷ = 21202145351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202155479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601072739 + 10601072740.

It is an arithmetic number, because the mean of its divisors is an integer number (10601072740).

Almost surely, 2^21202145479 is an apocalyptic number.

21202145479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202145479 is an equidigital number, since it uses as much as digits as its factorization.

21202145479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21202145479 in words is "twenty-one billion, two hundred two million, one hundred forty-five thousand, four hundred seventy-nine".