211211999192 has 8 divisors (see below), whose sum is σ = 396022498500. Its totient is φ = 105605999592.

The previous prime is 211211999149. The next prime is 211211999221. The reversal of 211211999192 is 291999112112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×211211999192² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13200749942 + ... + 13200749957.

Almost surely, 2^211211999192 is an apocalyptic number.

It is an amenable number.

211211999192 is a deficient number, since it is larger than the sum of its proper divisors (184810499308).

211211999192 is a wasteful number, since it uses less digits than its factorization.

211211999192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26401499905 (or 26401499901 counting only the distinct ones).

The product of its digits is 52488, while the sum is 47.

The spelling of 211211999192 in words is "two hundred eleven billion, two hundred eleven million, nine hundred ninety-nine thousand, one hundred ninety-two".