21537425520071 has 2 divisors, whose sum is σ = 21537425520072. Its totient is φ = 21537425520070.

The previous prime is 21537425520067. The next prime is 21537425520101. The reversal of 21537425520071 is 17002552473512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21537425520071 - 2² = 21537425520067 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21537425520011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768712760035 + 10768712760036.

It is an arithmetic number, because the mean of its divisors is an integer number (10768712760036).

Almost surely, 2^{21537425520071} is an apocalyptic number.

21537425520071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21537425520071 is an equidigital number, since it uses as much as digits as its factorization.

21537425520071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588000, while the sum is 44.

Adding to 21537425520071 its reverse (17002552473512), we get a palindrome (38539977993583).

The spelling of 21537425520071 in words is "twenty-one trillion, five hundred thirty-seven billion, four hundred twenty-five million, five hundred twenty thousand, seventy-one".