10100021220 has 120 divisors (see below), whose sum is σ = 32130762048. Its totient is φ = 2655374400.

The previous prime is 10100021201. The next prime is 10100021227. The reversal of 10100021220 is 2212000101.

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

It is not an unprimeable number, because it can be changed into a prime (10100021227) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 71115 + ... + 158925.

Almost surely, 2^10100021220 is an apocalyptic number.

10100021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10100021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16065381024).

10100021220 is an abundant number, since it is smaller than the sum of its proper divisors (22030740828).

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

10100021220 is a wasteful number, since it uses less digits than its factorization.

10100021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87903 (or 87892 counting only the distinct ones).

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

Adding to 10100021220 its reverse (2212000101), we get a palindrome (12312021321).

The spelling of 10100021220 in words is "ten billion, one hundred million, twenty-one thousand, two hundred twenty".