221011210957 has 2 divisors, whose sum is σ = 221011210958. Its totient is φ = 221011210956.

The previous prime is 221011210951. The next prime is 221011210961. The reversal of 221011210957 is 759012110122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150273297801 + 70737913156 = 387651^2 + 265966^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011210957 - 2²⁷ = 220876993229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011210951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505605478 + 110505605479.

It is an arithmetic number, because the mean of its divisors is an integer number (110505605479).

Almost surely, 2^221011210957 is an apocalyptic number.

It is an amenable number.

221011210957 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011210957 is an equidigital number, since it uses as much as digits as its factorization.

221011210957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

The spelling of 221011210957 in words is "two hundred twenty-one billion, eleven million, two hundred ten thousand, nine hundred fifty-seven".