229202721 has 36 divisors (see below), whose sum is σ = 383710704. Its totient is φ = 130723200.

The previous prime is 229202717. The next prime is 229202723. The reversal of 229202721 is 127202922.

229202721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 229202721 - 2² = 229202717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (229202723) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24606 + ... + 32616.

Almost surely, 2^229202721 is an apocalyptic number.

It is an amenable number.

229202721 is a deficient number, since it is larger than the sum of its proper divisors (154507983).

229202721 is a wasteful number, since it uses less digits than its factorization.

229202721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062 (or 8042 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 229202721 is about 15139.4425590905. The cubic root of 229202721 is about 611.9837958673.

The spelling of 229202721 in words is "two hundred twenty-nine million, two hundred two thousand, seven hundred twenty-one".