122000100021 has 8 divisors (see below), whose sum is σ = 180740888960. Its totient is φ = 81333399996.

The previous prime is 122000099999. The next prime is 122000100059. The reversal of 122000100021 is 120001000221.

It is not a de Polignac number, because 122000100021 - 2⁹ = 122000099509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122000099976 and 122000100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122000100091) 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, 2259261085 + ... + 2259261138.

It is an arithmetic number, because the mean of its divisors is an integer number (22592611120).

Almost surely, 2^122000100021 is an apocalyptic number.

It is an amenable number.

122000100021 is a deficient number, since it is larger than the sum of its proper divisors (58740788939).

122000100021 is an equidigital number, since it uses as much as digits as its factorization.

122000100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518522232 (or 4518522226 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 122000100021 its reverse (120001000221), we get a palindrome (242001100242).

It can be divided in two parts, 1 and 22000100021, that added together give a palindrome (22000100022).

The spelling of 122000100021 in words is "one hundred twenty-two billion, one hundred thousand, twenty-one".