212157434 has 4 divisors (see below), whose sum is σ = 318236154. Its totient is φ = 106078716.

The previous prime is 212157431. The next prime is 212157457. The reversal of 212157434 is 434751212.

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

It can be written as a sum of positive squares in only one way, i.e., 141681409 + 70476025 = 11903^2 + 8395^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212157397 and 212157406.

It is not an unprimeable number, because it can be changed into a prime (212157431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53039357 + ... + 53039360.

Almost surely, 2^212157434 is an apocalyptic number.

212157434 is a deficient number, since it is larger than the sum of its proper divisors (106078720).

212157434 is a wasteful number, since it uses less digits than its factorization.

212157434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106078719.

The product of its digits is 6720, while the sum is 29.

The square root of 212157434 is about 14565.6250809912. The cubic root of 212157434 is about 596.4207593697.

The spelling of 212157434 in words is "two hundred twelve million, one hundred fifty-seven thousand, four hundred thirty-four".