12200000021 has 4 divisors (see below), whose sum is σ = 13309090944. Its totient is φ = 11090909100.

The previous prime is 12200000017. The next prime is 12200000023. The reversal of 12200000021 is 12000000221.

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 12200000021 - 2² = 12200000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12199999954 and 12200000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200000023) 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, 554545445 + ... + 554545466.

It is an arithmetic number, because the mean of its divisors is an integer number (3327272736).

Almost surely, 2^12200000021 is an apocalyptic number.

12200000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12200000021 is a deficient number, since it is larger than the sum of its proper divisors (1109090923).

12200000021 is a wasteful number, since it uses less digits than its factorization.

12200000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109090922.

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

Adding to 12200000021 its reverse (12000000221), we get a palindrome (24200000242).

It can be divided in two parts, 1 and 2200000021, that added together give a palindrome (2200000022).

The spelling of 12200000021 in words is "twelve billion, two hundred million, twenty-one", and thus it is an aban number.