21142501279 has 2 divisors, whose sum is σ = 21142501280. Its totient is φ = 21142501278.

The previous prime is 21142501249. The next prime is 21142501343. The reversal of 21142501279 is 97210524112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21142501279 - 2³¹ = 18995017631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142501229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571250639 + 10571250640.

It is an arithmetic number, because the mean of its divisors is an integer number (10571250640).

Almost surely, 2^21142501279 is an apocalyptic number.

21142501279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142501279 is an equidigital number, since it uses as much as digits as its factorization.

21142501279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 21142501279 in words is "twenty-one billion, one hundred forty-two million, five hundred one thousand, two hundred seventy-nine".