1251421014105 has 24 divisors (see below), whose sum is σ = 2169967138560. Its totient is φ = 667166885280.

The previous prime is 1251421014089. The next prime is 1251421014133. The reversal of 1251421014105 is 5014101241521.

1251421014105 is a `hidden beast` number, since 1 + 2 + 5 + 142 + 101 + 410 + 5 = 666.

It is not a de Polignac number, because 1251421014105 - 2⁴ = 1251421014089 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5249935 + ... + 5483124.

It is an arithmetic number, because the mean of its divisors is an integer number (90415297440).

Almost surely, 2^{1251421014105} is an apocalyptic number.

1251421014105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251421014105 is a deficient number, since it is larger than the sum of its proper divisors (918546124455).

1251421014105 is a wasteful number, since it uses less digits than its factorization.

1251421014105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10735661 (or 10735658 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

Adding to 1251421014105 its reverse (5014101241521), we get a palindrome (6265522255626).

The spelling of 1251421014105 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, fourteen thousand, one hundred five".