21514531143977 has 2 divisors, whose sum is σ = 21514531143978. Its totient is φ = 21514531143976.

The previous prime is 21514531143943. The next prime is 21514531143979. The reversal of 21514531143977 is 77934113541512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21301326392896 + 213204751081 = 4615336^2 + 461741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21514531143977 is a prime.

Together with 21514531143979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21514531143979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757265571988 + 10757265571989.

It is an arithmetic number, because the mean of its divisors is an integer number (10757265571989).

Almost surely, 2^{21514531143977} is an apocalyptic number.

It is an amenable number.

21514531143977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514531143977 is an equidigital number, since it uses as much as digits as its factorization.

21514531143977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The spelling of 21514531143977 in words is "twenty-one trillion, five hundred fourteen billion, five hundred thirty-one million, one hundred forty-three thousand, nine hundred seventy-seven".