1999122211 has 24 divisors (see below), whose sum is σ = 2151497376. Its totient is φ = 1856574720.

The previous prime is 1999122199. The next prime is 1999122217. The reversal of 1999122211 is 1122219991.

It is not a de Polignac number, because 1999122211 - 2¹¹ = 1999120163 is a prime.

It is a super-2 number, since 2×1999122211² = 7992979229027057042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999122217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3167866 + ... + 3168496.

It is an arithmetic number, because the mean of its divisors is an integer number (89645724).

Almost surely, 2^1999122211 is an apocalyptic number.

1999122211 is a deficient number, since it is larger than the sum of its proper divisors (152375165).

1999122211 is a wasteful number, since it uses less digits than its factorization.

1999122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 820 counting only the distinct ones).

The product of its digits is 5832, while the sum is 37.

The square root of 1999122211 is about 44711.5444935645. The cubic root of 1999122211 is about 1259.7366987823.

The spelling of 1999122211 in words is "one billion, nine hundred ninety-nine million, one hundred twenty-two thousand, two hundred eleven".