2215231211957 has 2 divisors, whose sum is σ = 2215231211958. Its totient is φ = 2215231211956.

The previous prime is 2215231211917. The next prime is 2215231212091. The reversal of 2215231211957 is 7591121325122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2155614176401 + 59617035556 = 1468201^2 + 244166^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215231211957 - 2¹⁶ = 2215231146421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215231211917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107615605978 + 1107615605979.

It is an arithmetic number, because the mean of its divisors is an integer number (1107615605979).

Almost surely, 2^{2215231211957} is an apocalyptic number.

It is an amenable number.

2215231211957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215231211957 is an equidigital number, since it uses as much as digits as its factorization.

2215231211957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The spelling of 2215231211957 in words is "two trillion, two hundred fifteen billion, two hundred thirty-one million, two hundred eleven thousand, nine hundred fifty-seven".