221440170 has 32 divisors (see below), whose sum is σ = 607379328. Its totient is φ = 50614848.

The previous prime is 221440169. The next prime is 221440189. The reversal of 221440170 is 71044122.

It is a happy number.

221440170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527029 + ... + 527448.

It is an arithmetic number, because the mean of its divisors is an integer number (18980604).

Almost surely, 2^221440170 is an apocalyptic number.

221440170 is an abundant number, since it is smaller than the sum of its proper divisors (385939158).

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

221440170 is a wasteful number, since it uses less digits than its factorization.

221440170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054494.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 221440170 is about 14880.8659022249. The cubic root of 221440170 is about 604.9954875241.

Adding to 221440170 its reverse (71044122), we get a palindrome (292484292).

It can be divided in two parts, 221 and 440170, that added together give a triangular number (440391 = T₉₃₈).

The spelling of 221440170 in words is "two hundred twenty-one million, four hundred forty thousand, one hundred seventy".