1220211212100 has 72 divisors (see below), whose sum is σ = 3558276922368. Its totient is φ = 322827523200.

The previous prime is 1220211211937. The next prime is 1220211212111. The reversal of 1220211212100 is 12121120221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1220211212100.

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, 15975171 + ... + 16051370.

Almost surely, 2^{1220211212100} is an apocalyptic number.

1220211212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220211212100 is an abundant number, since it is smaller than the sum of its proper divisors (2338065710268).

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

1220211212100 is a wasteful number, since it uses less digits than its factorization.

1220211212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32026685 (or 32026678 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220211212100 its reverse (12121120221), we get a palindrome (1232332332321).

The spelling of 1220211212100 in words is "one trillion, two hundred twenty billion, two hundred eleven million, two hundred twelve thousand, one hundred".