121513910 has 16 divisors (see below), whose sum is σ = 249971616. Its totient is φ = 41661888.

The previous prime is 121513907. The next prime is 121513919. The reversal of 121513910 is 19315121.

121513910 = 1161² + 1162² + ... + 1244².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867887 + ... + 868026.

It is an arithmetic number, because the mean of its divisors is an integer number (15623226).

Almost surely, 2^121513910 is an apocalyptic number.

121513910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121513910 is an abundant number, since it is smaller than the sum of its proper divisors (128457706).

121513910 is a wasteful number, since it uses less digits than its factorization.

121513910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735927.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 121513910 is about 11023.3347948795. The cubic root of 121513910 is about 495.3079877685.

It can be divided in two parts, 12151 and 3910, that added together give a palindrome (16061).

The spelling of 121513910 in words is "one hundred twenty-one million, five hundred thirteen thousand, nine hundred ten".