21352508423977 has 2 divisors, whose sum is σ = 21352508423978. Its totient is φ = 21352508423976.

The previous prime is 21352508423899. The next prime is 21352508423993. The reversal of 21352508423977 is 77932480525312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11000260088896 + 10352248335081 = 3316664^2 + 3217491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352508423977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21352508123977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676254211988 + 10676254211989.

It is an arithmetic number, because the mean of its divisors is an integer number (10676254211989).

Almost surely, 2^{21352508423977} is an apocalyptic number.

It is an amenable number.

21352508423977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352508423977 is an equidigital number, since it uses as much as digits as its factorization.

21352508423977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 21352508423977 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred eight million, four hundred twenty-three thousand, nine hundred seventy-seven".