20021001222 has 32 divisors (see below), whose sum is σ = 41794444800. Its totient is φ = 6381752960.

The previous prime is 20021001193. The next prime is 20021001229. The reversal of 20021001222 is 22210012002.

It is a junction number, because it is equal to n+sod(n) for n = 20021001198 and 20021001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021001229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540847 + ... + 576677.

It is an arithmetic number, because the mean of its divisors is an integer number (1306076400).

Almost surely, 2^20021001222 is an apocalyptic number.

20021001222 is an abundant number, since it is smaller than the sum of its proper divisors (21773443578).

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

20021001222 is a wasteful number, since it uses less digits than its factorization.

20021001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39908.

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

Adding to 20021001222 its reverse (22210012002), we get a palindrome (42231013224).

The spelling of 20021001222 in words is "twenty billion, twenty-one million, one thousand, two hundred twenty-two".