121821030 has 64 divisors (see below), whose sum is σ = 331024320. Its totient is φ = 31868928.

The previous prime is 121821001. The next prime is 121821043. The reversal of 121821030 is 30128121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121820994 and 121821012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10054 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (5172255).

Almost surely, 2^121821030 is an apocalyptic number.

121821030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121821030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165512160).

121821030 is an abundant number, since it is smaller than the sum of its proper divisors (209203290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121821030 is a wasteful number, since it uses less digits than its factorization.

121821030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582 (or 8576 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121821030 is about 11037.2564525791. The cubic root of 121821030 is about 495.7249249770.

Adding to 121821030 its reverse (30128121), we get a palindrome (151949151).

The spelling of 121821030 in words is "one hundred twenty-one million, eight hundred twenty-one thousand, thirty".