121503040 has 56 divisors (see below), whose sum is σ = 299328840. Its totient is φ = 46921728.

The previous prime is 121503017. The next prime is 121503071. The reversal of 121503040 is 40305121.

It can be written as a sum of positive squares in 4 ways, for example, as 35236096 + 86266944 = 5936^2 + 9288^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734 + ... + 15826.

Almost surely, 2^121503040 is an apocalyptic number.

121503040 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 121503040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149664420).

121503040 is an abundant number, since it is smaller than the sum of its proper divisors (177825800).

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

121503040 is a wasteful number, since it uses less digits than its factorization.

121503040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13139 (or 13129 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 121503040 is about 11022.8417388621. The cubic root of 121503040 is about 495.2932181058.

Adding to 121503040 its reverse (40305121), we get a palindrome (161808161).

The spelling of 121503040 in words is "one hundred twenty-one million, five hundred three thousand, forty".