121820830 has 16 divisors (see below), whose sum is σ = 220953744. Its totient is φ = 48355840.

The previous prime is 121820819. The next prime is 121820869. The reversal of 121820830 is 38028121.

It is a junction number, because it is equal to n+sod(n) for n = 121820795 and 121820804.

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, 45187 + ... + 47806.

It is an arithmetic number, because the mean of its divisors is an integer number (13809609).

Almost surely, 2^121820830 is an apocalyptic number.

121820830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121820830 is a deficient number, since it is larger than the sum of its proper divisors (99132914).

121820830 is a wasteful number, since it uses less digits than its factorization.

121820830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93131.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 121820830 is about 11037.2473923529. The cubic root of 121820830 is about 495.7246536909.

Adding to 121820830 its reverse (38028121), we get a palindrome (159848951).

The spelling of 121820830 in words is "one hundred twenty-one million, eight hundred twenty thousand, eight hundred thirty".