121011540 has 96 divisors (see below), whose sum is σ = 367476480. Its totient is φ = 29577216.

The previous prime is 121011529. The next prime is 121011547. The reversal of 121011540 is 45110121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011547) 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, 129796 + ... + 130724.

It is an arithmetic number, because the mean of its divisors is an integer number (3827880).

Almost surely, 2^121011540 is an apocalyptic number.

121011540 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 121011540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183738240).

121011540 is an abundant number, since it is smaller than the sum of its proper divisors (246464940).

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

121011540 is a wasteful number, since it uses less digits than its factorization.

121011540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 121011540 is about 11000.5245329484. The cubic root of 121011540 is about 494.6244677504.

Adding to 121011540 its reverse (45110121), we get a palindrome (166121661).

The spelling of 121011540 in words is "one hundred twenty-one million, eleven thousand, five hundred forty".