210221240 has 16 divisors (see below), whose sum is σ = 472997880. Its totient is φ = 84088480.

The previous prime is 210221233. The next prime is 210221251. The reversal of 210221240 is 42122012.

210221240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2627726 + ... + 2627805.

Almost surely, 2^210221240 is an apocalyptic number.

210221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221240 is an abundant number, since it is smaller than the sum of its proper divisors (262776640).

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

210221240 is a wasteful number, since it uses less digits than its factorization.

210221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255542 (or 5255538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 210221240 is about 14499.0082419454. The cubic root of 210221240 is about 594.6008574599.

Adding to 210221240 its reverse (42122012), we get a palindrome (252343252).

The spelling of 210221240 in words is "two hundred ten million, two hundred twenty-one thousand, two hundred forty".