221330101957 has 2 divisors, whose sum is σ = 221330101958. Its totient is φ = 221330101956.

The previous prime is 221330101933. The next prime is 221330101963. The reversal of 221330101957 is 759101033122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192291897121 + 29038204836 = 438511^2 + 170406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221330101957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221330101987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665050978 + 110665050979.

It is an arithmetic number, because the mean of its divisors is an integer number (110665050979).

Almost surely, 2^221330101957 is an apocalyptic number.

It is an amenable number.

221330101957 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330101957 is an equidigital number, since it uses as much as digits as its factorization.

221330101957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 221330101957 in words is "two hundred twenty-one billion, three hundred thirty million, one hundred one thousand, nine hundred fifty-seven".