229131108921 has 128 divisors (see below), whose sum is σ = 378846720000. Its totient is φ = 121206666240.

The previous prime is 229131108917. The next prime is 229131108929. The reversal of 229131108921 is 129801131922.

It is not a de Polignac number, because 229131108921 - 2² = 229131108917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 229131108921.

It is not an unprimeable number, because it can be changed into a prime (229131108929) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 459180330 + ... + 459180828.

It is an arithmetic number, because the mean of its divisors is an integer number (2959740000).

Almost surely, 2^229131108921 is an apocalyptic number.

It is an amenable number.

229131108921 is a deficient number, since it is larger than the sum of its proper divisors (149715611079).

229131108921 is a wasteful number, since it uses less digits than its factorization.

229131108921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 15552, while the sum is 39.

The spelling of 229131108921 in words is "two hundred twenty-nine billion, one hundred thirty-one million, one hundred eight thousand, nine hundred twenty-one".