2121100957 has 2 divisors, whose sum is σ = 2121100958. Its totient is φ = 2121100956.

The previous prime is 2121100951. The next prime is 2121100981. The reversal of 2121100957 is 7590011212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2029592601 + 91508356 = 45051^2 + 9566^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121100957 - 2¹¹ = 2121098909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121100951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060550478 + 1060550479.

It is an arithmetic number, because the mean of its divisors is an integer number (1060550479).

Almost surely, 2^2121100957 is an apocalyptic number.

It is an amenable number.

2121100957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121100957 is an equidigital number, since it uses as much as digits as its factorization.

2121100957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 2121100957 is about 46055.4118101228. The cubic root of 2121100957 is about 1284.8539972499.

The spelling of 2121100957 in words is "two billion, one hundred twenty-one million, one hundred thousand, nine hundred fifty-seven".