200121222021 has 32 divisors (see below), whose sum is σ = 320118988800. Its totient is φ = 108790395840.

The previous prime is 200121222017. The next prime is 200121222079. The reversal of 200121222021 is 120222121002.

It is not a de Polignac number, because 200121222021 - 2² = 200121222017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2566726 + ... + 2643543.

It is an arithmetic number, because the mean of its divisors is an integer number (10003718400).

Almost surely, 2^200121222021 is an apocalyptic number.

200121222021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

200121222021 is a deficient number, since it is larger than the sum of its proper divisors (119997766779).

200121222021 is a wasteful number, since it uses less digits than its factorization.

200121222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210369.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 200121222021 its reverse (120222121002), we get a palindrome (320343343023).

The spelling of 200121222021 in words is "two hundred billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".