211212999 has 6 divisors (see below), whose sum is σ = 305085456. Its totient is φ = 140808660.

The previous prime is 211212973. The next prime is 211213007. The reversal of 211212999 is 999212112.

It is not a de Polignac number, because 211212999 - 2⁹ = 211212487 is a prime.

It is a super-2 number, since 2×211212999² = 89221861893148002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734047 + ... + 11734064.

It is an arithmetic number, because the mean of its divisors is an integer number (50847576).

Almost surely, 2^211212999 is an apocalyptic number.

211212999 is a deficient number, since it is larger than the sum of its proper divisors (93872457).

211212999 is a wasteful number, since it uses less digits than its factorization.

211212999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23468117 (or 23468114 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 211212999 is about 14533.1689249110. The cubic root of 211212999 is about 595.5344387234.

The spelling of 211212999 in words is "two hundred eleven million, two hundred twelve thousand, nine hundred ninety-nine".