87857714090221 has 2 divisors, whose sum is σ = 87857714090222. Its totient is φ = 87857714090220.

The previous prime is 87857714090197. The next prime is 87857714090233. The reversal of 87857714090221 is 12209041775878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47739614896996 + 40118099193225 = 6909386^2 + 6333885^2 .

It is a cyclic number.

It is not a de Polignac number, because 87857714090221 - 2⁵ = 87857714090189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87857714090221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87857714091221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43928857045110 + 43928857045111.

It is an arithmetic number, because the mean of its divisors is an integer number (43928857045111).

Almost surely, 2^{87857714090221} is an apocalyptic number.

It is an amenable number.

87857714090221 is a deficient number, since it is larger than the sum of its proper divisors (1).

87857714090221 is an equidigital number, since it uses as much as digits as its factorization.

87857714090221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15805440, while the sum is 61.

The spelling of 87857714090221 in words is "eighty-seven trillion, eight hundred fifty-seven billion, seven hundred fourteen million, ninety thousand, two hundred twenty-one".