211905045 has 32 divisors (see below), whose sum is σ = 410970240. Its totient is φ = 102741120.

The previous prime is 211905037. The next prime is 211905061. The reversal of 211905045 is 540509112.

It is not a de Polignac number, because 211905045 - 2³ = 211905037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69864 + ... + 72833.

It is an arithmetic number, because the mean of its divisors is an integer number (12842820).

Almost surely, 2^211905045 is an apocalyptic number.

It is an amenable number.

211905045 is a deficient number, since it is larger than the sum of its proper divisors (199065195).

211905045 is a wasteful number, since it uses less digits than its factorization.

211905045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142722 (or 142716 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 211905045 is about 14556.9586452665. The cubic root of 211905045 is about 596.1841587041.

The spelling of 211905045 in words is "two hundred eleven million, nine hundred five thousand, forty-five".