221471390 has 32 divisors (see below), whose sum is σ = 461099520. Its totient is φ = 75016224.

The previous prime is 221471389. The next prime is 221471399. The reversal of 221471390 is 93174122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221471399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13250 + ... + 24869.

It is an arithmetic number, because the mean of its divisors is an integer number (14409360).

Almost surely, 2^221471390 is an apocalyptic number.

221471390 is an abundant number, since it is smaller than the sum of its proper divisors (239628130).

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

221471390 is a wasteful number, since it uses less digits than its factorization.

221471390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38216.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 221471390 is about 14881.9148633501. The cubic root of 221471390 is about 605.0239181856.

The spelling of 221471390 in words is "two hundred twenty-one million, four hundred seventy-one thousand, three hundred ninety".