220001221024 has 24 divisors (see below), whose sum is σ = 466444897380. Its totient is φ = 101539024896.

The previous prime is 220001221007. The next prime is 220001221031. The reversal of 220001221024 is 420122100022.

It can be written as a sum of positive squares in 2 ways, for example, as 180567204624 + 39434016400 = 424932^2 + 198580^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 220001220989 and 220001221007.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264424129 + ... + 264424960.

Almost surely, 2^220001221024 is an apocalyptic number.

It is an amenable number.

220001221024 is an abundant number, since it is smaller than the sum of its proper divisors (246443676356).

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

220001221024 is a wasteful number, since it uses less digits than its factorization.

220001221024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528849112 (or 528849104 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 220001221024 its reverse (420122100022), we get a palindrome (640123321046).

The spelling of 220001221024 in words is "two hundred twenty billion, one million, two hundred twenty-one thousand, twenty-four".