21120222122121 has 8 divisors (see below), whose sum is σ = 28160960537344. Its totient is φ = 14079815894160.

The previous prime is 21120222122117. The next prime is 21120222122159. The reversal of 21120222122121 is 12122122202112.

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

It is not a de Polignac number, because 21120222122121 - 2² = 21120222122117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120222122161) 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, 82898425 + ... + 83152806.

It is an arithmetic number, because the mean of its divisors is an integer number (3520120067168).

Almost surely, 2^{21120222122121} is an apocalyptic number.

It is an amenable number.

21120222122121 is a deficient number, since it is larger than the sum of its proper divisors (7040738415223).

21120222122121 is a wasteful number, since it uses less digits than its factorization.

21120222122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166093631.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21120222122121 its reverse (12122122202112), we get a palindrome (33242344324233).

The spelling of 21120222122121 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".