1011202121957 has 2 divisors, whose sum is σ = 1011202121958. Its totient is φ = 1011202121956.

The previous prime is 1011202121953. The next prime is 1011202122037. The reversal of 1011202121957 is 7591212021101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544044908836 + 467157213121 = 737594^2 + 683489^2 .

It is an emirp because it is prime and its reverse (7591212021101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011202121957 - 2² = 1011202121953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011202121953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505601060978 + 505601060979.

It is an arithmetic number, because the mean of its divisors is an integer number (505601060979).

Almost surely, 2^{1011202121957} is an apocalyptic number.

It is an amenable number.

1011202121957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011202121957 is an equidigital number, since it uses as much as digits as its factorization.

1011202121957 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 32.

The spelling of 1011202121957 in words is "one trillion, eleven billion, two hundred two million, one hundred twenty-one thousand, nine hundred fifty-seven".