121911860 has 96 divisors (see below), whose sum is σ = 305157888. Its totient is φ = 40043520.

The previous prime is 121911851. The next prime is 121911869. The reversal of 121911860 is 68119121.

It is an interprime number because it is at equal distance from previous prime (121911851) and next prime (121911869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121911869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384422 + ... + 384738.

It is an arithmetic number, because the mean of its divisors is an integer number (3178728).

Almost surely, 2^121911860 is an apocalyptic number.

121911860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121911860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152578944).

121911860 is an abundant number, since it is smaller than the sum of its proper divisors (183246028).

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

121911860 is a wasteful number, since it uses less digits than its factorization.

121911860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 121911860 is about 11041.3703859621. The cubic root of 121911860 is about 495.8480988628.

The spelling of 121911860 in words is "one hundred twenty-one million, nine hundred eleven thousand, eight hundred sixty".