200121220231 has 2 divisors, whose sum is σ = 200121220232. Its totient is φ = 200121220230.

The previous prime is 200121220193. The next prime is 200121220249. The reversal of 200121220231 is 132022121002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200121220231 is a prime.

It is a super-2 number, since 2×200121220231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060610115 + 100060610116.

It is an arithmetic number, because the mean of its divisors is an integer number (100060610116).

Almost surely, 2^200121220231 is an apocalyptic number.

200121220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121220231 is an equidigital number, since it uses as much as digits as its factorization.

200121220231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 200121220231 its reverse (132022121002), we get a palindrome (332143341233).

The spelling of 200121220231 in words is "two hundred billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirty-one".