121122200000021 has 4 divisors (see below), whose sum is σ = 132133309090944. Its totient is φ = 110111090909100.

The previous prime is 121122199999981. The next prime is 121122200000051. The reversal of 121122200000021 is 120000002221121.

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 121122200000021 - 2¹⁰ = 121122199998997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121122199999951 and 121122200000005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122200000051) 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, 5505554545445 + ... + 5505554545466.

It is an arithmetic number, because the mean of its divisors is an integer number (33033327272736).

Almost surely, 2^{121122200000021} is an apocalyptic number.

121122200000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121122200000021 is a deficient number, since it is larger than the sum of its proper divisors (11011109090923).

121122200000021 is a wasteful number, since it uses less digits than its factorization.

121122200000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011109090922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121122200000021 its reverse (120000002221121), we get a palindrome (241122202221142).

The spelling of 121122200000021 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, two hundred million, twenty-one", and thus it is an aban number.