122100001000021 has 4 divisors (see below), whose sum is σ = 133200001090944. Its totient is φ = 111000000909100.

The previous prime is 122100000999971. The next prime is 122100001000093. The reversal of 122100001000021 is 120000100001221.

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 a de Polignac number, because none of the positive numbers 2^k-122100001000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122100000999971 and 122100001000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122100001000921) 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, 5550000045445 + ... + 5550000045466.

It is an arithmetic number, because the mean of its divisors is an integer number (33300000272736).

Almost surely, 2^{122100001000021} is an apocalyptic number.

122100001000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122100001000021 is a deficient number, since it is larger than the sum of its proper divisors (11100000090923).

122100001000021 is a wasteful number, since it uses less digits than its factorization.

122100001000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100000090922.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 122100001000021 its reverse (120000100001221), we get a palindrome (242100101001242).

The spelling of 122100001000021 in words is "one hundred twenty-two trillion, one hundred billion, one million, twenty-one", and thus it is an aban number.