211992490 has 8 divisors (see below), whose sum is σ = 381586500. Its totient is φ = 84796992.

The previous prime is 211992479. The next prime is 211992491. The reversal of 211992490 is 94299112.

It can be written as a sum of positive squares in 2 ways, for example, as 180284329 + 31708161 = 13427^2 + 5631^2 .

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

It is not an unprimeable number, because it can be changed into a prime (211992491) 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, 10599615 + ... + 10599634.

Almost surely, 2^211992490 is an apocalyptic number.

211992490 is a deficient number, since it is larger than the sum of its proper divisors (169594010).

211992490 is a wasteful number, since it uses less digits than its factorization.

211992490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21199256.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 211992490 is about 14559.9618818182. The cubic root of 211992490 is about 596.2661547923.

The spelling of 211992490 in words is "two hundred eleven million, nine hundred ninety-two thousand, four hundred ninety".