22121211220220 has 24 divisors (see below), whose sum is σ = 53090906928864. Its totient is φ = 7584415275456.

The previous prime is 22121211220211. The next prime is 22121211220247. The reversal of 22121211220220 is 2202211212122.

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 = 22121211220192 and 22121211220201.

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, 79004325647 + ... + 79004325926.

It is an arithmetic number, because the mean of its divisors is an integer number (2212121122036).

Almost surely, 2^{22121211220220} is an apocalyptic number.

22121211220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121211220220 is an abundant number, since it is smaller than the sum of its proper divisors (30969695708644).

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

22121211220220 is a wasteful number, since it uses less digits than its factorization.

22121211220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158008651589 (or 158008651587 counting only the distinct ones).

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

Adding to 22121211220220 its reverse (2202211212122), we get a palindrome (24323422432342).

The spelling of 22121211220220 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty".