10121515550 has 48 divisors (see below), whose sum is σ = 19138775040. Its totient is φ = 3981750240.

The previous prime is 10121515543. The next prime is 10121515559. The reversal of 10121515550 is 5551512101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121515559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1033979 + ... + 1043721.

It is an arithmetic number, because the mean of its divisors is an integer number (398724480).

Almost surely, 2^10121515550 is an apocalyptic number.

10121515550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10121515550 is a deficient number, since it is larger than the sum of its proper divisors (9017259490).

10121515550 is a wasteful number, since it uses less digits than its factorization.

10121515550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10097 (or 10092 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 26.

The spelling of 10121515550 in words is "ten billion, one hundred twenty-one million, five hundred fifteen thousand, five hundred fifty".