12635201421 has 40 divisors (see below), whose sum is σ = 18995644800. Its totient is φ = 8369736480.

The previous prime is 12635201401. The next prime is 12635201437. The reversal of 12635201421 is 12410253621.

12635201421 is a `hidden beast` number, since 1 + 2 + 6 + 35 + 201 + 421 = 666.

It is not a de Polignac number, because 12635201421 - 2⁶ = 12635201357 is a prime.

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 (12635201401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13748400 + ... + 13749318.

It is an arithmetic number, because the mean of its divisors is an integer number (474891120).

Almost surely, 2^12635201421 is an apocalyptic number.

It is an amenable number.

12635201421 is a deficient number, since it is larger than the sum of its proper divisors (6360443379).

12635201421 is an equidigital number, since it uses as much as digits as its factorization.

12635201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1822 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 12635201421 in words is "twelve billion, six hundred thirty-five million, two hundred one thousand, four hundred twenty-one".