212147192997 has 12 divisors (see below), whose sum is σ = 307206715660. Its totient is φ = 141075209088.

The previous prime is 212147192981. The next prime is 212147193043. The reversal of 212147192997 is 799291741212.

It can be written as a sum of positive squares in 2 ways, for example, as 131601347361 + 80545845636 = 362769^2 + 283806^2 .

It is not a de Polignac number, because 212147192997 - 2⁴ = 212147192981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212147192497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29683972 + ... + 29691117.

Almost surely, 2^212147192997 is an apocalyptic number.

It is an amenable number.

212147192997 is a deficient number, since it is larger than the sum of its proper divisors (95059522663).

212147192997 is a wasteful number, since it uses less digits than its factorization.

212147192997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59375492 (or 59375489 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 212147192997 in words is "two hundred twelve billion, one hundred forty-seven million, one hundred ninety-two thousand, nine hundred ninety-seven".