221308829 has 8 divisors (see below), whose sum is σ = 263921280. Its totient is φ = 181445616.

The previous prime is 221308819. The next prime is 221308837. The reversal of 221308829 is 928803122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221308829 - 2¹⁶ = 221243293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221308819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687134 + ... + 687455.

It is an arithmetic number, because the mean of its divisors is an integer number (32990160).

Almost surely, 2^221308829 is an apocalyptic number.

It is an amenable number.

221308829 is a deficient number, since it is larger than the sum of its proper divisors (42612451).

221308829 is a wasteful number, since it uses less digits than its factorization.

221308829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374619.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 221308829 is about 14876.4521644107. The cubic root of 221308829 is about 604.8758518569.

The spelling of 221308829 in words is "two hundred twenty-one million, three hundred eight thousand, eight hundred twenty-nine".