402120122 has 4 divisors (see below), whose sum is σ = 603180186. Its totient is φ = 201060060.

The previous prime is 402120101. The next prime is 402120139. The reversal of 402120122 is 221021204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 397962601 + 4157521 = 19949^2 + 2039^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402120097 and 402120106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100530029 + ... + 100530032.

Almost surely, 2^402120122 is an apocalyptic number.

402120122 is a deficient number, since it is larger than the sum of its proper divisors (201060064).

402120122 is a wasteful number, since it uses less digits than its factorization.

402120122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201060063.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 402120122 is about 20052.9330024313. The cubic root of 402120122 is about 738.1057725958.

Adding to 402120122 its reverse (221021204), we get a palindrome (623141326).

The spelling of 402120122 in words is "four hundred two million, one hundred twenty thousand, one hundred twenty-two".