121211420 has 24 divisors (see below), whose sum is σ = 277684848. Its totient is φ = 44076800.

The previous prime is 121211399. The next prime is 121211437. The reversal of 121211420 is 24112121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121211395 and 121211404.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 275261 + ... + 275700.

It is an arithmetic number, because the mean of its divisors is an integer number (11570202).

Almost surely, 2^121211420 is an apocalyptic number.

121211420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211420 is an abundant number, since it is smaller than the sum of its proper divisors (156473428).

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

121211420 is a wasteful number, since it uses less digits than its factorization.

121211420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550981 (or 550979 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121211420 is about 11009.6058058406. The cubic root of 121211420 is about 494.8966488306.

Adding to 121211420 its reverse (24112121), we get a palindrome (145323541).

The spelling of 121211420 in words is "one hundred twenty-one million, two hundred eleven thousand, four hundred twenty".