22012102121 has 4 divisors (see below), whose sum is σ = 22159834500. Its totient is φ = 21864369744.

The previous prime is 22012102111. The next prime is 22012102157. The reversal of 22012102121 is 12120121022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12120121022 = 2 ⋅6060060511.

It can be written as a sum of positive squares in 2 ways, for example, as 2533712896 + 19478389225 = 50336^2 + 139565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22012102121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012102096 and 22012102105.

It is not an unprimeable number, because it can be changed into a prime (22012102111) 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, 73865966 + ... + 73866263.

It is an arithmetic number, because the mean of its divisors is an integer number (5539958625).

Almost surely, 2^22012102121 is an apocalyptic number.

It is an amenable number.

22012102121 is a deficient number, since it is larger than the sum of its proper divisors (147732379).

22012102121 is a wasteful number, since it uses less digits than its factorization.

22012102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147732378.

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

Adding to 22012102121 its reverse (12120121022), we get a palindrome (34132223143).

The spelling of 22012102121 in words is "twenty-two billion, twelve million, one hundred two thousand, one hundred twenty-one".