20121222222220 has 48 divisors (see below), whose sum is σ = 48312814878720. Its totient is φ = 6895578826944.

The previous prime is 20121222222187. The next prime is 20121222222251. The reversal of 20121222222220 is 2222222212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121222222191 and 20121222222200.

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, 32251740 + ... + 32869699.

It is an arithmetic number, because the mean of its divisors is an integer number (1006516976640).

Almost surely, 2^{20121222222220} is an apocalyptic number.

20121222222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121222222220 is an abundant number, since it is smaller than the sum of its proper divisors (28191592656500).

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

20121222222220 is a wasteful number, since it uses less digits than its factorization.

20121222222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65123662 (or 65123660 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 20121222222220 its reverse (2222222212102), we get a palindrome (22343444434322).

The spelling of 20121222222220 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".