202121057 has 2 divisors, whose sum is σ = 202121058. Its totient is φ = 202121056.

The previous prime is 202121053. The next prime is 202121063. The reversal of 202121057 is 750121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168376576 + 33744481 = 12976^2 + 5809^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121057 - 2² = 202121053 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202121053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060528 + 101060529.

It is an arithmetic number, because the mean of its divisors is an integer number (101060529).

Almost surely, 2^202121057 is an apocalyptic number.

It is an amenable number.

202121057 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121057 is an equidigital number, since it uses as much as digits as its factorization.

202121057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 202121057 is about 14216.9285360798. The cubic root of 202121057 is about 586.8636182670.

Adding to 202121057 its reverse (750121202), we get a palindrome (952242259).

The spelling of 202121057 in words is "two hundred two million, one hundred twenty-one thousand, fifty-seven".