211264405 has 16 divisors (see below), whose sum is σ = 280464768. Its totient is φ = 151480000.

The previous prime is 211264399. The next prime is 211264421. The reversal of 211264405 is 504462112.

It is a happy number.

It is not a de Polignac number, because 211264405 - 2⁹ = 211263893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211264405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23146 + ... + 30955.

It is an arithmetic number, because the mean of its divisors is an integer number (17529048).

Almost surely, 2^211264405 is an apocalyptic number.

It is an amenable number.

211264405 is a deficient number, since it is larger than the sum of its proper divisors (69200363).

211264405 is a wasteful number, since it uses less digits than its factorization.

211264405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54188.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 211264405 is about 14534.9373923660. The cubic root of 211264405 is about 595.5827494495.

The spelling of 211264405 in words is "two hundred eleven million, two hundred sixty-four thousand, four hundred five".