221002201957 has 2 divisors, whose sum is σ = 221002201958. Its totient is φ = 221002201956.

The previous prime is 221002201943. The next prime is 221002201991. The reversal of 221002201957 is 759102200122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207285341796 + 13716860161 = 455286^2 + 117119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002201957 is a prime.

It is a super-2 number, since 2×221002201957² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221002201157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501100978 + 110501100979.

It is an arithmetic number, because the mean of its divisors is an integer number (110501100979).

Almost surely, 2^221002201957 is an apocalyptic number.

It is an amenable number.

221002201957 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002201957 is an equidigital number, since it uses as much as digits as its factorization.

221002201957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 221002201957 in words is "two hundred twenty-one billion, two million, two hundred one thousand, nine hundred fifty-seven".