20021221102 has 16 divisors (see below), whose sum is σ = 32348454912. Its totient is φ = 9266483160.

The previous prime is 20021221097. The next prime is 20021221109. The reversal of 20021221102 is 20112212002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021221109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7018638 + ... + 7021489.

It is an arithmetic number, because the mean of its divisors is an integer number (2021778432).

Almost surely, 2^20021221102 is an apocalyptic number.

20021221102 is a deficient number, since it is larger than the sum of its proper divisors (12327233810).

20021221102 is a wasteful number, since it uses less digits than its factorization.

20021221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040183.

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

Adding to 20021221102 its reverse (20112212002), we get a palindrome (40133433104).

The spelling of 20021221102 in words is "twenty billion, twenty-one million, two hundred twenty-one thousand, one hundred two".