402200000021 has 4 divisors (see below), whose sum is σ = 402201272172. Its totient is φ = 402198727872.

The previous prime is 402199999987. The next prime is 402200000047. The reversal of 402200000021 is 120000002204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 238368532900 + 163831467121 = 488230^2 + 404761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402200000021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 402199999948 and 402200000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402200000821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244685 + ... + 929661.

It is an arithmetic number, because the mean of its divisors is an integer number (100550318043).

Almost surely, 2^402200000021 is an apocalyptic number.

It is an amenable number.

402200000021 is a deficient number, since it is larger than the sum of its proper divisors (1272151).

402200000021 is an equidigital number, since it uses as much as digits as its factorization.

402200000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272150.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 402200000021 its reverse (120000002204), we get a palindrome (522200002225).

The spelling of 402200000021 in words is "four hundred two billion, two hundred million, twenty-one", and thus it is an aban number.