121440555 has 12 divisors (see below), whose sum is σ = 210497040. Its totient is φ = 64768272.

The previous prime is 121440551. The next prime is 121440559. The reversal of 121440555 is 555044121.

It is an interprime number because it is at equal distance from previous prime (121440551) and next prime (121440559).

It is not a de Polignac number, because 121440555 - 2² = 121440551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121440551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1349295 + ... + 1349384.

It is an arithmetic number, because the mean of its divisors is an integer number (17541420).

Almost surely, 2^121440555 is an apocalyptic number.

121440555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121440555 is a deficient number, since it is larger than the sum of its proper divisors (89056485).

121440555 is a wasteful number, since it uses less digits than its factorization.

121440555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698690 (or 2698687 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 121440555 is about 11020.0070326656. The cubic root of 121440555 is about 495.2082992333.

Adding to 121440555 its reverse (555044121), we get a palindrome (676484676).

The spelling of 121440555 in words is "one hundred twenty-one million, four hundred forty thousand, five hundred fifty-five".