211538290 has 8 divisors (see below), whose sum is σ = 380768940. Its totient is φ = 84615312.

The previous prime is 211538273. The next prime is 211538297. The reversal of 211538290 is 92835112.

It can be written as a sum of positive squares in 2 ways, for example, as 186568281 + 24970009 = 13659^2 + 4997^2 .

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

It is a super-2 number, since 2×211538290² = 89496896272248200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211538297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10576905 + ... + 10576924.

Almost surely, 2^211538290 is an apocalyptic number.

211538290 is a deficient number, since it is larger than the sum of its proper divisors (169230650).

211538290 is a wasteful number, since it uses less digits than its factorization.

211538290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21153836.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 211538290 is about 14544.3559499897. The cubic root of 211538290 is about 595.8400111835.

The spelling of 211538290 in words is "two hundred eleven million, five hundred thirty-eight thousand, two hundred ninety".