211920745 has 8 divisors (see below), whose sum is σ = 254406600. Its totient is φ = 169468800.

The previous prime is 211920713. The next prime is 211920757. The reversal of 211920745 is 547029112.

211920745 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 4 ways, for example, as 14714896 + 197205849 = 3836^2 + 14043^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211920745 - 2⁵ = 211920713 is a prime.

It is a super-2 number, since 2×211920745² = 89820804322710050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8295 + ... + 22195.

It is an arithmetic number, because the mean of its divisors is an integer number (31800825).

Almost surely, 2^211920745 is an apocalyptic number.

It is an amenable number.

211920745 is a deficient number, since it is larger than the sum of its proper divisors (42485855).

211920745 is a wasteful number, since it uses less digits than its factorization.

211920745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16955.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 211920745 is about 14557.4978962732. The cubic root of 211920745 is about 596.1988820600.

Adding to 211920745 its reverse (547029112), we get a palindrome (758949857).

The spelling of 211920745 in words is "two hundred eleven million, nine hundred twenty thousand, seven hundred forty-five".