12501045421 has 16 divisors (see below), whose sum is σ = 13956226560. Its totient is φ = 11127905280.

The previous prime is 12501045413. The next prime is 12501045439. The reversal of 12501045421 is 12454010521.

It is a cyclic number.

It is not a de Polignac number, because 12501045421 - 2³ = 12501045413 is a prime.

It is a super-2 number, since 2×12501045421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501045521) 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, 164181 + ... + 227941.

It is an arithmetic number, because the mean of its divisors is an integer number (872264160).

Almost surely, 2^12501045421 is an apocalyptic number.

It is an amenable number.

12501045421 is a deficient number, since it is larger than the sum of its proper divisors (1455181139).

12501045421 is a wasteful number, since it uses less digits than its factorization.

12501045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64404.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 12501045421 its reverse (12454010521), we get a palindrome (24955055942).

The spelling of 12501045421 in words is "twelve billion, five hundred one million, forty-five thousand, four hundred twenty-one".