121540110 has 16 divisors (see below), whose sum is σ = 291696336. Its totient is φ = 32410688.

The previous prime is 121540099. The next prime is 121540163. The reversal of 121540110 is 11045121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121540110.

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, 2025639 + ... + 2025698.

It is an arithmetic number, because the mean of its divisors is an integer number (18231021).

Almost surely, 2^121540110 is an apocalyptic number.

121540110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121540110 is an abundant number, since it is smaller than the sum of its proper divisors (170156226).

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

121540110 is a wasteful number, since it uses less digits than its factorization.

121540110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051347.

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

The square root of 121540110 is about 11024.5231189381. The cubic root of 121540110 is about 495.3435835197.

Adding to 121540110 its reverse (11045121), we get a palindrome (132585231).

The spelling of 121540110 in words is "one hundred twenty-one million, five hundred forty thousand, one hundred ten".