401521122 has 18 divisors (see below), whose sum is σ = 870146667. Its totient is φ = 133812036.

The previous prime is 401521111. The next prime is 401521171. The reversal of 401521122 is 221125104.

It can be written as a sum of positive squares in only one way, i.e., 200760561 + 200760561 = 14169^2 + 14169^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14169.

It is a super-2 number, since 2×401521122² = 322438422824277768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 401521095 and 401521104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82653 + ... + 87375.

Almost surely, 2^401521122 is an apocalyptic number.

401521122 is an abundant number, since it is smaller than the sum of its proper divisors (468625545).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401521122 is an frugal number, since it uses more digits than its factorization.

401521122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9454 (or 4728 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 401521122 is about 20037.9919652644. The cubic root of 401521122 is about 737.7390952058.

Multiplying 401521122 by its sum of digits (18), we get a square (7227380196 = 85014²).

401521122 divided by its sum of digits (18) gives a square (22306729 = 4723²).

Adding to 401521122 its reverse (221125104), we get a palindrome (622646226).

The spelling of 401521122 in words is "four hundred one million, five hundred twenty-one thousand, one hundred twenty-two".