20212122220220 has 24 divisors (see below), whose sum is σ = 48509093328864. Its totient is φ = 6929870475456.

The previous prime is 20212122220219. The next prime is 20212122220343. The reversal of 20212122220220 is 2202222121202.

It is a super-2 number, since 2×20212122220220² (a number of 27 digits) contains 22 as substring.

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 = 20212122220192 and 20212122220201.

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, 72186150647 + ... + 72186150926.

It is an arithmetic number, because the mean of its divisors is an integer number (2021212222036).

Almost surely, 2^{20212122220220} is an apocalyptic number.

20212122220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212122220220 is an abundant number, since it is smaller than the sum of its proper divisors (28296971108644).

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

20212122220220 is a wasteful number, since it uses less digits than its factorization.

20212122220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144372301589 (or 144372301587 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20212122220220 its reverse (2202222121202), we get a palindrome (22414344341422).

The spelling of 20212122220220 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twenty".