12200001000021 has 6 divisors (see below), whose sum is σ = 17622223666710. Its totient is φ = 8133334000008.

The previous prime is 12200000999983. The next prime is 12200001000043. The reversal of 12200001000021 is 12000010000221.

It can be written as a sum of positive squares in only one way, i.e., 11959078076100 + 240922923921 = 3458190^2 + 490839^2 .

It is not a de Polignac number, because 12200001000021 - 2¹⁸ = 12200000737877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1355555666669 = 12200001000021 / (1 + 2 + 2 + 0 + 0 + 0 + 0 + 1 + 0 + 0 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 12200000999967 and 12200001000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200001000091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 677777833326 + ... + 677777833343.

It is an arithmetic number, because the mean of its divisors is an integer number (2937037277785).

Almost surely, 2^{12200001000021} is an apocalyptic number.

It is an amenable number.

12200001000021 is a deficient number, since it is larger than the sum of its proper divisors (5422222666689).

12200001000021 is a wasteful number, since it uses less digits than its factorization.

12200001000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355555666675 (or 1355555666672 counting only the distinct ones).

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

Adding to 12200001000021 its reverse (12000010000221), we get a palindrome (24200011000242).

It can be divided in two parts, 1 and 2200001000021, that added together give a palindrome (2200001000022).

The spelling of 12200001000021 in words is "twelve trillion, two hundred billion, one million, twenty-one", and thus it is an aban number.