20111221020120 has 64 divisors (see below), whose sum is σ = 60335356727520. Its totient is φ = 5362841723904.

The previous prime is 20111221020113. The next prime is 20111221020173. The reversal of 20111221020120 is 2102012211102.

It is a super-2 number, since 2×20111221020120² (a number of 27 digits) contains 22 as substring.

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 20111221020120.

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, 1973274 + ... + 6642006.

Almost surely, 2^{20111221020120} is an apocalyptic number.

20111221020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111221020120 is an abundant number, since it is smaller than the sum of its proper divisors (40224135707400).

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

20111221020120 is a wasteful number, since it uses less digits than its factorization.

20111221020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704644 (or 4704640 counting only the distinct ones).

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

Adding to 20111221020120 its reverse (2102012211102), we get a palindrome (22213233231222).

The spelling of 20111221020120 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred twenty".