10001021220 has 72 divisors (see below), whose sum is σ = 30358298880. Its totient is φ = 2665016640.

The previous prime is 10001021209. The next prime is 10001021231. The reversal of 10001021220 is 2212010001.

It is an interprime number because it is at equal distance from previous prime (10001021209) and next prime (10001021231).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239715 + ... + 278325.

It is an arithmetic number, because the mean of its divisors is an integer number (421643040).

Almost surely, 2^10001021220 is an apocalyptic number.

10001021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001021220 is an abundant number, since it is smaller than the sum of its proper divisors (20357277660).

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

10001021220 is a wasteful number, since it uses less digits than its factorization.

10001021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40065 (or 40060 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10001021220 its reverse (2212010001), we get a palindrome (12213031221).

The spelling of 10001021220 in words is "ten billion, one million, twenty-one thousand, two hundred twenty".