21514897879 has 2 divisors, whose sum is σ = 21514897880. Its totient is φ = 21514897878.

The previous prime is 21514897867. The next prime is 21514897883. The reversal of 21514897879 is 97879841512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21514897879 - 2⁵ = 21514897847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514897819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757448939 + 10757448940.

It is an arithmetic number, because the mean of its divisors is an integer number (10757448940).

Almost surely, 2^21514897879 is an apocalyptic number.

21514897879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514897879 is an equidigital number, since it uses as much as digits as its factorization.

21514897879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 61.

The spelling of 21514897879 in words is "twenty-one billion, five hundred fourteen million, eight hundred ninety-seven thousand, eight hundred seventy-nine".