212099831 has 4 divisors (see below), whose sum is σ = 223263000. Its totient is φ = 200936664.

The previous prime is 212099827. The next prime is 212099851. The reversal of 212099831 is 138990212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212099831 - 2² = 212099827 is a prime.

It is a super-2 number, since 2×212099831² = 89972676620457122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212099791 and 212099800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212099801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5581556 + ... + 5581593.

It is an arithmetic number, because the mean of its divisors is an integer number (55815750).

Almost surely, 2^212099831 is an apocalyptic number.

212099831 is a deficient number, since it is larger than the sum of its proper divisors (11163169).

212099831 is a wasteful number, since it uses less digits than its factorization.

212099831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11163168.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 212099831 is about 14563.6475856840. The cubic root of 212099831 is about 596.3667762903.

The spelling of 212099831 in words is "two hundred twelve million, ninety-nine thousand, eight hundred thirty-one".