211987422 has 16 divisors (see below), whose sum is σ = 471083280. Its totient is φ = 70662456.

The previous prime is 211987421. The next prime is 211987429. The reversal of 211987422 is 224789112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211987421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962793 + ... + 1962900.

It is an arithmetic number, because the mean of its divisors is an integer number (29442705).

Almost surely, 2^211987422 is an apocalyptic number.

211987422 is an abundant number, since it is smaller than the sum of its proper divisors (259095858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211987422 is a wasteful number, since it uses less digits than its factorization.

211987422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925704 (or 3925698 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 211987422 is about 14559.7878418609. The cubic root of 211987422 is about 596.2614032074.

The spelling of 211987422 in words is "two hundred eleven million, nine hundred eighty-seven thousand, four hundred twenty-two".