20211120102221 has 4 divisors (see below), whose sum is σ = 20225905121952. Its totient is φ = 20196335082492.

The previous prime is 20211120102211. The next prime is 20211120102241. The reversal of 20211120102221 is 12220102111202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20211120102221 - 2¹⁸ = 20211119840077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211120102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211120102211) 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, 7392507815 + ... + 7392510548.

It is an arithmetic number, because the mean of its divisors is an integer number (5056476280488).

Almost surely, 2^{20211120102221} is an apocalyptic number.

It is an amenable number.

20211120102221 is a deficient number, since it is larger than the sum of its proper divisors (14785019731).

20211120102221 is a wasteful number, since it uses less digits than its factorization.

20211120102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785019730.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211120102221 its reverse (12220102111202), we get a palindrome (32431222213423).

The spelling of 20211120102221 in words is "twenty trillion, two hundred eleven billion, one hundred twenty million, one hundred two thousand, two hundred twenty-one".