20211212222120 has 64 divisors (see below), whose sum is σ = 46498144089600. Its totient is φ = 7903043115520.

The previous prime is 20211212222059. The next prime is 20211212222137. The reversal of 20211212222120 is 2122221211202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20211212222092 and 20211212222101.

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, 4829501 + ... + 7984140.

It is an arithmetic number, because the mean of its divisors is an integer number (726533501400).

Almost surely, 2^{20211212222120} is an apocalyptic number.

20211212222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211212222120 is an abundant number, since it is smaller than the sum of its proper divisors (26286931867480).

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

20211212222120 is a wasteful number, since it uses less digits than its factorization.

20211212222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12814538 (or 12814534 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20211212222120 its reverse (2122221211202), we get a palindrome (22333433433322).

The spelling of 20211212222120 in words is "twenty trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty".