12501421401 has 48 divisors (see below), whose sum is σ = 19811977920. Its totient is φ = 6989875200.

The previous prime is 12501421399. The next prime is 12501421501. The reversal of 12501421401 is 10412410521.

It is not a de Polignac number, because 12501421401 - 2¹ = 12501421399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12501421001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1264126 + ... + 1273976.

It is an arithmetic number, because the mean of its divisors is an integer number (412749540).

Almost surely, 2^12501421401 is an apocalyptic number.

It is an amenable number.

12501421401 is a deficient number, since it is larger than the sum of its proper divisors (7310556519).

12501421401 is an equidigital number, since it uses as much as digits as its factorization.

12501421401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10054 (or 10047 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 12501421401 its reverse (10412410521), we get a palindrome (22913831922).

The spelling of 12501421401 in words is "twelve billion, five hundred one million, four hundred twenty-one thousand, four hundred one".