211445045 has 18 divisors (see below), whose sum is σ = 295478082. Its totient is φ = 144834816.

The previous prime is 211445033. The next prime is 211445081. The reversal of 211445045 is 540544112.

211445045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 21473956 + 189971089 = 4634^2 + 13783^2 .

It is not a de Polignac number, because 211445045 - 2¹⁰ = 211444021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 227141 + ... + 228069.

It is an arithmetic number, because the mean of its divisors is an integer number (16415449).

Almost surely, 2^211445045 is an apocalyptic number.

It is an amenable number.

211445045 is a deficient number, since it is larger than the sum of its proper divisors (84033037).

211445045 is an frugal number, since it uses more digits than its factorization.

211445045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 211445045 is about 14541.1500576811. The cubic root of 211445045 is about 595.7524505702.

Adding to 211445045 its reverse (540544112), we get a palindrome (751989157).

It can be divided in two parts, 21 and 1445045, that multiplied together give a triangular number (30345945 = T₇₇₉₀).

The spelling of 211445045 in words is "two hundred eleven million, four hundred forty-five thousand, forty-five".