4001121522 has 40 divisors (see below), whose sum is σ = 9005054256. Its totient is φ = 1327819608.

The previous prime is 4001121499. The next prime is 4001121541. The reversal of 4001121522 is 2251211004.

4001121522 is a `hidden beast` number, since 400 + 112 + 152 + 2 = 666.

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 = 4001121495 and 4001121504.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17628 + ... + 91175.

Almost surely, 2^4001121522 is an apocalyptic number.

4001121522 is an abundant number, since it is smaller than the sum of its proper divisors (5003932734).

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

4001121522 is a wasteful number, since it uses less digits than its factorization.

4001121522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109044 (or 109035 counting only the distinct ones).

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

The square root of 4001121522 is about 63254.4189918776. The cubic root of 4001121522 is about 1587.5493968716.

Adding to 4001121522 its reverse (2251211004), we get a palindrome (6252332526).

The spelling of 4001121522 in words is "four billion, one million, one hundred twenty-one thousand, five hundred twenty-two".