20100222121221 has 24 divisors (see below), whose sum is σ = 31714697738880. Its totient is φ = 12165944932800.

The previous prime is 20100222121219. The next prime is 20100222121247. The reversal of 20100222121221 is 12212122200102.

It is a happy number.

20100222121221 is a `hidden beast` number, since 2 + 0 + 100 + 222 + 121 + 221 = 666.

It is not a de Polignac number, because 20100222121221 - 2¹ = 20100222121219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20100222121194 and 20100222121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100222121121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133323181 + ... + 133473858.

It is an arithmetic number, because the mean of its divisors is an integer number (1321445739120).

Almost surely, 2^{20100222121221} is an apocalyptic number.

It is an amenable number.

20100222121221 is a deficient number, since it is larger than the sum of its proper divisors (11614475617659).

20100222121221 is a wasteful number, since it uses less digits than its factorization.

20100222121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266797817 (or 266797814 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20100222121221 its reverse (12212122200102), we get a palindrome (32312344321323).

The spelling of 20100222121221 in words is "twenty trillion, one hundred billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".