212156473 has 4 divisors (see below), whose sum is σ = 212186880. Its totient is φ = 212126068.

The previous prime is 212156429. The next prime is 212156479. The reversal of 212156473 is 374651212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212156473 - 2⁹ = 212155961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212156479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068 + ... + 20626.

It is an arithmetic number, because the mean of its divisors is an integer number (53046720).

Almost surely, 2^212156473 is an apocalyptic number.

It is an amenable number.

212156473 is a deficient number, since it is larger than the sum of its proper divisors (30407).

212156473 is a wasteful number, since it uses less digits than its factorization.

212156473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30406.

The product of its digits is 10080, while the sum is 31.

The square root of 212156473 is about 14565.5920923250. The cubic root of 212156473 is about 596.4198588415.

The spelling of 212156473 in words is "two hundred twelve million, one hundred fifty-six thousand, four hundred seventy-three".