1221111200120 has 64 divisors (see below), whose sum is σ = 3157542259200. Its totient is φ = 416327760000.

The previous prime is 1221111200117. The next prime is 1221111200137. The reversal of 1221111200120 is 210021111221.

It is a super-2 number, since 2×1221111200120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1221111200095 and 1221111200104.

It is a congruent number.

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, 12131756 + ... + 12231995.

It is an arithmetic number, because the mean of its divisors is an integer number (49336597800).

Almost surely, 2^{1221111200120} is an apocalyptic number.

1221111200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221111200120 is an abundant number, since it is smaller than the sum of its proper divisors (1936431059080).

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

1221111200120 is a wasteful number, since it uses less digits than its factorization.

1221111200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24363948 (or 24363944 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221111200120 its reverse (210021111221), we get a palindrome (1431132311341).

It can be divided in two parts, 122111 and 1200120, that added together give a palindrome (1322231).

The spelling of 1221111200120 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred thousand, one hundred twenty".