121206820 has 48 divisors (see below), whose sum is σ = 298771200. Its totient is φ = 40431744.

The previous prime is 121206797. The next prime is 121206823. The reversal of 121206820 is 28602121.

It is a junction number, because it is equal to n+sod(n) for n = 121206791 and 121206800.

It is not an unprimeable number, because it can be changed into a prime (121206823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6520 + ... + 16879.

It is an arithmetic number, because the mean of its divisors is an integer number (6224400).

Almost surely, 2^121206820 is an apocalyptic number.

121206820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121206820 is an abundant number, since it is smaller than the sum of its proper divisors (177564380).

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

121206820 is a wasteful number, since it uses less digits than its factorization.

121206820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23452 (or 23450 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 121206820 is about 11009.3968953799. The cubic root of 121206820 is about 494.8903882725.

Adding to 121206820 its reverse (28602121), we get a palindrome (149808941).

The spelling of 121206820 in words is "one hundred twenty-one million, two hundred six thousand, eight hundred twenty".