20211221111022 has 24 divisors (see below), whose sum is σ = 43877012451480. Its totient is φ = 6723837799440.

The previous prime is 20211221110987. The next prime is 20211221111047. The reversal of 20211221111022 is 22011112211202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20211221110986 and 20211221111004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1102982604 + ... + 1103000927.

It is an arithmetic number, because the mean of its divisors is an integer number (1828208852145).

Almost surely, 2^{20211221111022} is an apocalyptic number.

20211221111022 is an abundant number, since it is smaller than the sum of its proper divisors (23665791340458).

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

20211221111022 is a wasteful number, since it uses less digits than its factorization.

20211221111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205984048 (or 2205984045 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20211221111022 its reverse (22011112211202), we get a palindrome (42222333322224).

The spelling of 20211221111022 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, twenty-two".