212705997 has 16 divisors (see below), whose sum is σ = 324519552. Its totient is φ = 121397760.

The previous prime is 212705971. The next prime is 212706017. The reversal of 212705997 is 799507212.

It is not a de Polignac number, because 212705997 - 2⁷ = 212705869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212705917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12753 + ... + 24249.

It is an arithmetic number, because the mean of its divisors is an integer number (20282472).

Almost surely, 2^212705997 is an apocalyptic number.

It is an amenable number.

212705997 is a deficient number, since it is larger than the sum of its proper divisors (111813555).

212705997 is a wasteful number, since it uses less digits than its factorization.

212705997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12388.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 212705997 is about 14584.4436643980. The cubic root of 212705997 is about 596.9343603217.

The spelling of 212705997 in words is "two hundred twelve million, seven hundred five thousand, nine hundred ninety-seven".