20001221022 has 16 divisors (see below), whose sum is σ = 40005877392. Its totient is φ = 6666501120.

The previous prime is 20001220997. The next prime is 20001221039. The reversal of 20001221022 is 22012210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001220989 and 20001221007.

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, 64093 + ... + 210024.

It is an arithmetic number, because the mean of its divisors is an integer number (2500367337).

Almost surely, 2^20001221022 is an apocalyptic number.

20001221022 is an abundant number, since it is smaller than the sum of its proper divisors (20004656370).

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

20001221022 is a wasteful number, since it uses less digits than its factorization.

20001221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286283.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001221022 its reverse (22012210002), we get a palindrome (42013431024).

The spelling of 20001221022 in words is "twenty billion, one million, two hundred twenty-one thousand, twenty-two".