221499829 has 2 divisors, whose sum is σ = 221499830. Its totient is φ = 221499828.

The previous prime is 221499827. The next prime is 221499847. The reversal of 221499829 is 928994122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150552900 + 70946929 = 12270^2 + 8423^2 .

It is a cyclic number.

It is not a de Polignac number, because 221499829 - 2¹ = 221499827 is a prime.

Together with 221499827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221499823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110749914 + 110749915.

It is an arithmetic number, because the mean of its divisors is an integer number (110749915).

Almost surely, 2^221499829 is an apocalyptic number.

It is an amenable number.

221499829 is a deficient number, since it is larger than the sum of its proper divisors (1).

221499829 is an equidigital number, since it uses as much as digits as its factorization.

221499829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 221499829 is about 14882.8703212788. The cubic root of 221499829 is about 605.0498139891.

The spelling of 221499829 in words is "two hundred twenty-one million, four hundred ninety-nine thousand, eight hundred twenty-nine".