20111221220120 has 32 divisors (see below), whose sum is σ = 45364228254000. Its totient is φ = 8024225286528.

The previous prime is 20111221220023. The next prime is 20111221220141. The reversal of 20111221220120 is 2102212211102.

It is a super-2 number, since 2×20111221220120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633208970 + ... + 633240729.

Almost surely, 2^{20111221220120} is an apocalyptic number.

20111221220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111221220120 is an abundant number, since it is smaller than the sum of its proper divisors (25253007033880).

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

20111221220120 is a wasteful number, since it uses less digits than its factorization.

20111221220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266450107 (or 1266450103 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20111221220120 its reverse (2102212211102), we get a palindrome (22213433431222).

The spelling of 20111221220120 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty".