122000000021 has 16 divisors (see below), whose sum is σ = 129107527680. Its totient is φ = 115044209280.

The previous prime is 121999999999. The next prime is 122000000033. The reversal of 122000000021 is 120000000221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122000000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121999999945 and 122000000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122000000051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3915020 + ... + 3946058.

It is an arithmetic number, because the mean of its divisors is an integer number (8069220480).

Almost surely, 2^122000000021 is an apocalyptic number.

It is an amenable number.

122000000021 is a deficient number, since it is larger than the sum of its proper divisors (7107527659).

122000000021 is a wasteful number, since it uses less digits than its factorization.

122000000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33476.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 122000000021 its reverse (120000000221), we get a palindrome (242000000242).

It can be divided in two parts, 1 and 22000000021, that added together give a palindrome (22000000022).

The spelling of 122000000021 in words is "one hundred twenty-two billion, twenty-one", and thus it is an aban number.