402031520122 has 4 divisors (see below), whose sum is σ = 603047280186. Its totient is φ = 201015760060.

The previous prime is 402031520069. The next prime is 402031520173. The reversal of 402031520122 is 221025130204.

It is a happy number.

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., 385292076961 + 16739443161 = 620719^2 + 129381^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402031520093 and 402031520102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100507880029 + ... + 100507880032.

Almost surely, 2^402031520122 is an apocalyptic number.

402031520122 is a deficient number, since it is larger than the sum of its proper divisors (201015760064).

402031520122 is a wasteful number, since it uses less digits than its factorization.

402031520122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201015760063.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 402031520122 its reverse (221025130204), we get a palindrome (623056650326).

The spelling of 402031520122 in words is "four hundred two billion, thirty-one million, five hundred twenty thousand, one hundred twenty-two".