20211221111102 has 16 divisors (see below), whose sum is σ = 34648239411072. Its totient is φ = 8661843956760.

The previous prime is 20211221111101. The next prime is 20211221111113. The reversal of 20211221111102 is 20111112211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211221111101) 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, 7826924 + ... + 10083807.

It is an arithmetic number, because the mean of its divisors is an integer number (2165514963192).

Almost surely, 2^{20211221111102} is an apocalyptic number.

20211221111102 is a deficient number, since it is larger than the sum of its proper divisors (14437018299970).

20211221111102 is a wasteful number, since it uses less digits than its factorization.

20211221111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991343.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20211221111102 its reverse (20111112211202), we get a palindrome (40322333322304).

The spelling of 20211221111102 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, one hundred two".