21222120100121 has 8 divisors (see below), whose sum is σ = 21725791169280. Its totient is φ = 20718909639792.

The previous prime is 21222120100109. The next prime is 21222120100123. The reversal of 21222120100121 is 12100102122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222120100121 - 2⁶ = 21222120100057 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 21222120100121.

It is not an unprimeable number, because it can be changed into a prime (21222120100123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115058966 + ... + 115243263.

It is an arithmetic number, because the mean of its divisors is an integer number (2715723896160).

Almost surely, 2^{21222120100121} is an apocalyptic number.

It is an amenable number.

21222120100121 is a deficient number, since it is larger than the sum of its proper divisors (503671069159).

21222120100121 is a wasteful number, since it uses less digits than its factorization.

21222120100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230304415.

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

Adding to 21222120100121 its reverse (12100102122212), we get a palindrome (33322222222333).

The spelling of 21222120100121 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred thousand, one hundred twenty-one".