218211490 has 64 divisors (see below), whose sum is σ = 477944064. Its totient is φ = 70023168.

The previous prime is 218211463. The next prime is 218211503. The reversal of 218211490 is 94112812.

218211490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276877 + ... + 277663.

It is an arithmetic number, because the mean of its divisors is an integer number (7467876).

Almost surely, 2^218211490 is an apocalyptic number.

218211490 is an abundant number, since it is smaller than the sum of its proper divisors (259732574).

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

218211490 is a wasteful number, since it uses less digits than its factorization.

218211490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 218211490 is about 14771.9832791674. The cubic root of 218211490 is about 602.0407271115.

The spelling of 218211490 in words is "two hundred eighteen million, two hundred eleven thousand, four hundred ninety".