121681420 has 24 divisors (see below), whose sum is σ = 292035744. Its totient is φ = 41719296.

The previous prime is 121681381. The next prime is 121681429. The reversal of 121681420 is 24186121.

It is not an unprimeable number, because it can be changed into a prime (121681429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434437 + ... + 434716.

It is an arithmetic number, because the mean of its divisors is an integer number (12168156).

Almost surely, 2^121681420 is an apocalyptic number.

121681420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121681420 is an abundant number, since it is smaller than the sum of its proper divisors (170354324).

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

121681420 is a wasteful number, since it uses less digits than its factorization.

121681420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869169 (or 869167 counting only the distinct ones).

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

The square root of 121681420 is about 11030.9301511704. The cubic root of 121681420 is about 495.5354814637.

The spelling of 121681420 in words is "one hundred twenty-one million, six hundred eighty-one thousand, four hundred twenty".