212311445 has 4 divisors (see below), whose sum is σ = 254773740. Its totient is φ = 169849152.

The previous prime is 212311417. The next prime is 212311447. The reversal of 212311445 is 544113212.

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 118570321 + 93741124 = 10889^2 + 9682^2 .

It is a cyclic number.

It is not a de Polignac number, because 212311445 - 2⁶ = 212311381 is a prime.

It is a super-2 number, since 2×212311445² = 90152299355976050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212311445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212311447) 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, 21231140 + ... + 21231149.

It is an arithmetic number, because the mean of its divisors is an integer number (63693435).

Almost surely, 2^212311445 is an apocalyptic number.

It is an amenable number.

212311445 is a deficient number, since it is larger than the sum of its proper divisors (42462295).

212311445 is an equidigital number, since it uses as much as digits as its factorization.

212311445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42462294.

The product of its digits is 960, while the sum is 23.

The square root of 212311445 is about 14570.9109186763. The cubic root of 212311445 is about 596.5650439512.

Adding to 212311445 its reverse (544113212), we get a palindrome (756424657).

The spelling of 212311445 in words is "two hundred twelve million, three hundred eleven thousand, four hundred forty-five".