211525402057 has 2 divisors, whose sum is σ = 211525402058. Its totient is φ = 211525402056.

The previous prime is 211525401979. The next prime is 211525402061. The reversal of 211525402057 is 750204525112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210626841481 + 898560576 = 458941^2 + 29976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211525402057 is a prime.

It is a super-4 number, since 4×211525402057⁴ (a number of 46 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (211525402097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105762701028 + 105762701029.

It is an arithmetic number, because the mean of its divisors is an integer number (105762701029).

Almost surely, 2^211525402057 is an apocalyptic number.

It is an amenable number.

211525402057 is a deficient number, since it is larger than the sum of its proper divisors (1).

211525402057 is an equidigital number, since it uses as much as digits as its factorization.

211525402057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 34.

Adding to 211525402057 its reverse (750204525112), we get a palindrome (961729927169).

The spelling of 211525402057 in words is "two hundred eleven billion, five hundred twenty-five million, four hundred two thousand, fifty-seven".