10111021220 has 48 divisors (see below), whose sum is σ = 21766132080. Its totient is φ = 3944134656.

The previous prime is 10111021189. The next prime is 10111021229. The reversal of 10111021220 is 2212011101.

It can be written as a sum of positive squares in 8 ways, for example, as 115820644 + 9995200576 = 10762^2 + 99976^2 .

It is a super-2 number, since 2×10111021220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10111021229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91034 + ... + 168846.

It is an arithmetic number, because the mean of its divisors is an integer number (453461085).

Almost surely, 2^10111021220 is an apocalyptic number.

10111021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10111021220 is an abundant number, since it is smaller than the sum of its proper divisors (11655110860).

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

10111021220 is a wasteful number, since it uses less digits than its factorization.

10111021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77984 (or 77982 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10111021220 its reverse (2212011101), we get a palindrome (12323032321).

The spelling of 10111021220 in words is "ten billion, one hundred eleven million, twenty-one thousand, two hundred twenty".