20011221022 has 8 divisors (see below), whose sum is σ = 32325818616. Its totient is φ = 9235948152.

The previous prime is 20011221017. The next prime is 20011221023. The reversal of 20011221022 is 22012211002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20011220993 and 20011221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384831148 + ... + 384831199.

It is an arithmetic number, because the mean of its divisors is an integer number (4040727327).

Almost surely, 2^20011221022 is an apocalyptic number.

20011221022 is a deficient number, since it is larger than the sum of its proper divisors (12314597594).

20011221022 is a wasteful number, since it uses less digits than its factorization.

20011221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769662362.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20011221022 its reverse (22012211002), we get a palindrome (42023432024).

The spelling of 20011221022 in words is "twenty billion, eleven million, two hundred twenty-one thousand, twenty-two".