402120101 has 2 divisors, whose sum is σ = 402120102. Its totient is φ = 402120100.

The previous prime is 402120079. The next prime is 402120139. The reversal of 402120101 is 101021204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377369476 + 24750625 = 19426^2 + 4975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402120101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402120151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201060050 + 201060051.

It is an arithmetic number, because the mean of its divisors is an integer number (201060051).

Almost surely, 2^402120101 is an apocalyptic number.

It is an amenable number.

402120101 is a deficient number, since it is larger than the sum of its proper divisors (1).

402120101 is an equidigital number, since it uses as much as digits as its factorization.

402120101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 402120101 is about 20052.9324788172. The cubic root of 402120101 is about 738.1057597470.

Adding to 402120101 its reverse (101021204), we get a palindrome (503141305).

The spelling of 402120101 in words is "four hundred two million, one hundred twenty thousand, one hundred one".