921242830 has 16 divisors (see below), whose sum is σ = 1660252320. Its totient is φ = 368049312.

The previous prime is 921242807. The next prime is 921242849. The reversal of 921242830 is 38242129.

It is a junction number, because it is equal to n+sod(n) for n = 921242792 and 921242801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47274 + ... + 63853.

It is an arithmetic number, because the mean of its divisors is an integer number (103765770).

Almost surely, 2^921242830 is an apocalyptic number.

921242830 is a deficient number, since it is larger than the sum of its proper divisors (739009490).

921242830 is a wasteful number, since it uses less digits than its factorization.

921242830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111963.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 921242830 is about 30351.9823075858. The cubic root of 921242830 is about 973.0265866074.

Adding to 921242830 its reverse (38242129), we get a palindrome (959484959).

The spelling of 921242830 in words is "nine hundred twenty-one million, two hundred forty-two thousand, eight hundred thirty".