1220022121200 has 60 divisors (see below), whose sum is σ = 3908137532088. Its totient is φ = 325339232000.

The previous prime is 1220022121111. The next prime is 1220022121217. The reversal of 1220022121200 is 21212200221.

It is a tau number, because it is divible by the number of its divisors (60).

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 1220022121200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 508341351 + ... + 508343750.

Almost surely, 2^{1220022121200} is an apocalyptic number.

1220022121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220022121200 is an abundant number, since it is smaller than the sum of its proper divisors (2688115410888).

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

1220022121200 is a wasteful number, since it uses less digits than its factorization.

1220022121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016685122 (or 1016685111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1220022121200 its reverse (21212200221), we get a palindrome (1241234321421).

The spelling of 1220022121200 in words is "one trillion, two hundred twenty billion, twenty-two million, one hundred twenty-one thousand, two hundred".