1202121281 has 2 divisors, whose sum is σ = 1202121282. Its totient is φ = 1202121280.

The previous prime is 1202121269. The next prime is 1202121307. The reversal of 1202121281 is 1821212021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915970225 + 286151056 = 30265^2 + 16916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1202121281 is a prime.

It is a super-2 number, since 2×1202121281² = 2890191148466161922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1202121881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601060640 + 601060641.

It is an arithmetic number, because the mean of its divisors is an integer number (601060641).

Almost surely, 2^1202121281 is an apocalyptic number.

It is an amenable number.

1202121281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202121281 is an equidigital number, since it uses as much as digits as its factorization.

1202121281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1202121281 is about 34671.6206860885. The cubic root of 1202121281 is about 1063.2843665330.

The spelling of 1202121281 in words is "one billion, two hundred two million, one hundred twenty-one thousand, two hundred eighty-one".