20213121222 has 36 divisors (see below), whose sum is σ = 50945317956. Its totient is φ = 5775177240.

The previous prime is 20213121217. The next prime is 20213121251. The reversal of 20213121222 is 22212131202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20213121195 and 20213121204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11457804 + ... + 11459567.

It is an arithmetic number, because the mean of its divisors is an integer number (1415147721).

Almost surely, 2^20213121222 is an apocalyptic number.

20213121222 is an abundant number, since it is smaller than the sum of its proper divisors (30732196734).

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

20213121222 is a wasteful number, since it uses less digits than its factorization.

20213121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22917393 (or 22917383 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20213121222 its reverse (22212131202), we get a palindrome (42425252424).

The spelling of 20213121222 in words is "twenty billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-two".