2121101057 has 2 divisors, whose sum is σ = 2121101058. Its totient is φ = 2121101056.

The previous prime is 2121101053. The next prime is 2121101069. The reversal of 2121101057 is 7501011212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1727316721 + 393784336 = 41561^2 + 19844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121101057 - 2² = 2121101053 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121101053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060550528 + 1060550529.

It is an arithmetic number, because the mean of its divisors is an integer number (1060550529).

Almost surely, 2^2121101057 is an apocalyptic number.

It is an amenable number.

2121101057 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121101057 is an equidigital number, since it uses as much as digits as its factorization.

2121101057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 2121101057 is about 46055.4128957715. The cubic root of 2121101057 is about 1284.8540174415.

Adding to 2121101057 its reverse (7501011212), we get a palindrome (9622112269).

The spelling of 2121101057 in words is "two billion, one hundred twenty-one million, one hundred one thousand, fifty-seven".