20111221199 has 2 divisors, whose sum is σ = 20111221200. Its totient is φ = 20111221198.

The previous prime is 20111221171. The next prime is 20111221219. The reversal of 20111221199 is 99112211102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111221199 - 2³² = 15816253903 is a prime.

It is a super-2 number, since 2×20111221199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111211199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055610599 + 10055610600.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610600).

Almost surely, 2^20111221199 is an apocalyptic number.

20111221199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221199 is an equidigital number, since it uses as much as digits as its factorization.

20111221199 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 20111221199 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, one hundred ninety-nine".