121821112 has 32 divisors (see below), whose sum is σ = 270050400. Its totient is φ = 50408064.

The previous prime is 121821101. The next prime is 121821143. The reversal of 121821112 is 211128121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 121821112.

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, 35883 + ... + 39130.

It is an arithmetic number, because the mean of its divisors is an integer number (8439075).

Almost surely, 2^121821112 is an apocalyptic number.

It is an amenable number.

121821112 is an abundant number, since it is smaller than the sum of its proper divisors (148229288).

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

121821112 is a wasteful number, since it uses less digits than its factorization.

121821112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75055 (or 75051 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

The square root of 121821112 is about 11037.2601672698. The cubic root of 121821112 is about 495.7250362042.

Adding to 121821112 its reverse (211128121), we get a palindrome (332949233).

The spelling of 121821112 in words is "one hundred twenty-one million, eight hundred twenty-one thousand, one hundred twelve".