212997973 has 4 divisors (see below), whose sum is σ = 213112620. Its totient is φ = 212883328.

The previous prime is 212997943. The next prime is 212997989. The reversal of 212997973 is 379799212.

212997973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111028369 + 101969604 = 10537^2 + 10098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212997973 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212997943) 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, 54490 + ... + 58267.

It is an arithmetic number, because the mean of its divisors is an integer number (53278155).

Almost surely, 2^212997973 is an apocalyptic number.

It is an amenable number.

212997973 is a deficient number, since it is larger than the sum of its proper divisors (114647).

212997973 is a wasteful number, since it uses less digits than its factorization.

212997973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114646.

The product of its digits is 428652, while the sum is 49.

The square root of 212997973 is about 14594.4500752855. The cubic root of 212997973 is about 597.2073675429.

The spelling of 212997973 in words is "two hundred twelve million, nine hundred ninety-seven thousand, nine hundred seventy-three".