221729490 has 48 divisors (see below), whose sum is σ = 578687616. Its totient is φ = 58903200.

The previous prime is 221729489. The next prime is 221729491. The reversal of 221729490 is 94927122.

It is an interprime number because it is at equal distance from previous prime (221729489) and next prime (221729491).

It is not an unprimeable number, because it can be changed into a prime (221729491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19845 + ... + 28935.

It is an arithmetic number, because the mean of its divisors is an integer number (12055992).

Almost surely, 2^221729490 is an apocalyptic number.

221729490 is an abundant number, since it is smaller than the sum of its proper divisors (356958126).

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

221729490 is a wasteful number, since it uses less digits than its factorization.

221729490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375 (or 9372 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 221729490 is about 14890.5839375090. The cubic root of 221729490 is about 605.2588560580.

The spelling of 221729490 in words is "two hundred twenty-one million, seven hundred twenty-nine thousand, four hundred ninety".