1212551510103 has 16 divisors (see below), whose sum is σ = 1799098540800. Its totient is φ = 807141003480.

The previous prime is 1212551510099. The next prime is 1212551510117. The reversal of 1212551510103 is 3010151552121.

It is a happy number.

1212551510103 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 551 + 5 + 1 + 0 + 103 = 666.

It is not a de Polignac number, because 1212551510103 - 2² = 1212551510099 is a prime.

It is a super-2 number, since 2×1212551510103² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212551510153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34056043 + ... + 34091628.

It is an arithmetic number, because the mean of its divisors is an integer number (112443658800).

Almost surely, 2^{1212551510103} is an apocalyptic number.

1212551510103 is a deficient number, since it is larger than the sum of its proper divisors (586547030697).

1212551510103 is an equidigital number, since it uses as much as digits as its factorization.

1212551510103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68148339 (or 68148333 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 1212551510103 in words is "one trillion, two hundred twelve billion, five hundred fifty-one million, five hundred ten thousand, one hundred three".