211072905 has 16 divisors (see below), whose sum is σ = 375240960. Its totient is φ = 112572144.

The previous prime is 211072891. The next prime is 211072907. The reversal of 211072905 is 509270112.

211072905 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 211072905 - 2⁸ = 211072649 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (211072907) 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, 781617 + ... + 781886.

It is an arithmetic number, because the mean of its divisors is an integer number (23452560).

Almost surely, 2^211072905 is an apocalyptic number.

It is an amenable number.

211072905 is a deficient number, since it is larger than the sum of its proper divisors (164168055).

211072905 is a wasteful number, since it uses less digits than its factorization.

211072905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563517 (or 1563511 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 211072905 is about 14528.3483231921. The cubic root of 211072905 is about 595.4027403038.

The spelling of 211072905 in words is "two hundred eleven million, seventy-two thousand, nine hundred five".