212040197 has 4 divisors (see below), whose sum is σ = 221259360. Its totient is φ = 202821036.

The previous prime is 212040161. The next prime is 212040203. The reversal of 212040197 is 791040212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212040197 - 2²⁰ = 210991621 is a prime.

It is a super-2 number, since 2×212040197² = 89922090287597618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212040497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4609547 + ... + 4609592.

It is an arithmetic number, because the mean of its divisors is an integer number (55314840).

Almost surely, 2^212040197 is an apocalyptic number.

It is an amenable number.

212040197 is a deficient number, since it is larger than the sum of its proper divisors (9219163).

212040197 is an equidigital number, since it uses as much as digits as its factorization.

212040197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9219162.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 212040197 is about 14561.6000837820. The cubic root of 212040197 is about 596.3108795463.

The spelling of 212040197 in words is "two hundred twelve million, forty thousand, one hundred ninety-seven".