121015540 has 24 divisors (see below), whose sum is σ = 255233160. Its totient is φ = 48196608.

The previous prime is 121015519. The next prime is 121015547. The reversal of 121015540 is 45510121.

It can be written as a sum of positive squares in 4 ways, for example, as 59536 + 120956004 = 244^2 + 10998^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121015547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8325 + ... + 17644.

It is an arithmetic number, because the mean of its divisors is an integer number (10634715).

Almost surely, 2^121015540 is an apocalyptic number.

121015540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121015540 is an abundant number, since it is smaller than the sum of its proper divisors (134217620).

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

121015540 is a wasteful number, since it uses less digits than its factorization.

121015540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26211 (or 26209 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121015540 is about 11000.7063409583. The cubic root of 121015540 is about 494.6299175779.

Adding to 121015540 its reverse (45510121), we get a palindrome (166525661).

The spelling of 121015540 in words is "one hundred twenty-one million, fifteen thousand, five hundred forty".