1021221100199 has 2 divisors, whose sum is σ = 1021221100200. Its totient is φ = 1021221100198.

The previous prime is 1021221100187. The next prime is 1021221100201. The reversal of 1021221100199 is 9910011221201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021221100199 - 2¹⁶ = 1021221034663 is a prime.

Together with 1021221100201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021221100139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610550099 + 510610550100.

It is an arithmetic number, because the mean of its divisors is an integer number (510610550100).

Almost surely, 2^{1021221100199} is an apocalyptic number.

1021221100199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221100199 is an equidigital number, since it uses as much as digits as its factorization.

1021221100199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1021221100199 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred ninety-nine".