100012221220 has 48 divisors (see below), whose sum is σ = 210743730288. Its totient is φ = 39868252160.

The previous prime is 100012221209. The next prime is 100012221251. The reversal of 100012221220 is 22122210001.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2827899684 + 97184321536 = 53178^2 + 311744^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100012221220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17061090 + ... + 17066950.

It is an arithmetic number, because the mean of its divisors is an integer number (4390494381).

Almost surely, 2^100012221220 is an apocalyptic number.

100012221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100012221220 is an abundant number, since it is smaller than the sum of its proper divisors (110731509068).

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

100012221220 is a wasteful number, since it uses less digits than its factorization.

100012221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8640 (or 8638 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 100012221220 its reverse (22122210001), we get a palindrome (122134431221).

The spelling of 100012221220 in words is "one hundred billion, twelve million, two hundred twenty-one thousand, two hundred twenty".