1202121257 has 2 divisors, whose sum is σ = 1202121258. Its totient is φ = 1202121256.

The previous prime is 1202121191. The next prime is 1202121269. The reversal of 1202121257 is 7521212021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709103641 + 493017616 = 26629^2 + 22204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202121257 - 2⁸ = 1202121001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1202124257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601060628 + 601060629.

It is an arithmetic number, because the mean of its divisors is an integer number (601060629).

Almost surely, 2^1202121257 is an apocalyptic number.

It is an amenable number.

1202121257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202121257 is an equidigital number, since it uses as much as digits as its factorization.

1202121257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1202121257 is about 34671.6203399841. The cubic root of 1202121257 is about 1063.2843594569.

Adding to 1202121257 its reverse (7521212021), we get a palindrome (8723333278).

The spelling of 1202121257 in words is "one billion, two hundred two million, one hundred twenty-one thousand, two hundred fifty-seven".