20100122102221 has 4 divisors (see below), whose sum is σ = 22971568116832. Its totient is φ = 17228676087612.

The previous prime is 20100122102201. The next prime is 20100122102257. The reversal of 20100122102221 is 12220122100102.

It is a happy number.

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 20100122102221 - 2¹³ = 20100122094029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100122102195 and 20100122102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100122102201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1435723007295 + ... + 1435723007308.

It is an arithmetic number, because the mean of its divisors is an integer number (5742892029208).

Almost surely, 2^{20100122102221} is an apocalyptic number.

It is an amenable number.

20100122102221 is a deficient number, since it is larger than the sum of its proper divisors (2871446014611).

20100122102221 is an equidigital number, since it uses as much as digits as its factorization.

20100122102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871446014610.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20100122102221 its reverse (12220122100102), we get a palindrome (32320244202323).

The spelling of 20100122102221 in words is "twenty trillion, one hundred billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty-one".