211445445 has 16 divisors (see below), whose sum is σ = 338575680. Its totient is φ = 112683264.

The previous prime is 211445441. The next prime is 211445483. The reversal of 211445445 is 544544112.

211445445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211445445 - 2² = 211445441 is a prime.

It is a super-2 number, since 2×211445445² = 89418352422496050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211445441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17602 + ... + 27068.

It is an arithmetic number, because the mean of its divisors is an integer number (21160980).

Almost surely, 2^211445445 is an apocalyptic number.

It is an amenable number.

211445445 is a deficient number, since it is larger than the sum of its proper divisors (127130235).

211445445 is a wasteful number, since it uses less digits than its factorization.

211445445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10964.

The product of its digits is 12800, while the sum is 30.

The square root of 211445445 is about 14541.1638117449. The cubic root of 211445445 is about 595.7528262404.

Adding to 211445445 its reverse (544544112), we get a palindrome (755989557).

The spelling of 211445445 in words is "two hundred eleven million, four hundred forty-five thousand, four hundred forty-five".