20122100222221 has 4 divisors (see below), whose sum is σ = 20422430076352. Its totient is φ = 19821770368092.

The previous prime is 20122100222149. The next prime is 20122100222251. The reversal of 20122100222221 is 12222200122102.

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 20122100222221 - 2¹⁹ = 20122099697933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122100222251) 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, 150164926965 + ... + 150164927098.

It is an arithmetic number, because the mean of its divisors is an integer number (5105607519088).

Almost surely, 2^{20122100222221} is an apocalyptic number.

It is an amenable number.

20122100222221 is a deficient number, since it is larger than the sum of its proper divisors (300329854131).

20122100222221 is an equidigital number, since it uses as much as digits as its factorization.

20122100222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300329854130.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20122100222221 its reverse (12222200122102), we get a palindrome (32344300344323).

The spelling of 20122100222221 in words is "twenty trillion, one hundred twenty-two billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-one".