121711220 has 12 divisors (see below), whose sum is σ = 255593604. Its totient is φ = 48684480.

The previous prime is 121711201. The next prime is 121711273. The reversal of 121711220 is 22117121.

121711220 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60808804 + 60902416 = 7798^2 + 7804^2 .

121711220 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3042761 + ... + 3042800.

It is an arithmetic number, because the mean of its divisors is an integer number (21299467).

Almost surely, 2^121711220 is an apocalyptic number.

121711220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121711220 is an abundant number, since it is smaller than the sum of its proper divisors (133882384).

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

121711220 is a wasteful number, since it uses less digits than its factorization.

121711220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6085570 (or 6085568 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 121711220 is about 11032.2808158603. The cubic root of 121711220 is about 495.5759306740.

Adding to 121711220 its reverse (22117121), we get a palindrome (143828341).

The spelling of 121711220 in words is "one hundred twenty-one million, seven hundred eleven thousand, two hundred twenty".