21043414525 has 24 divisors (see below), whose sum is σ = 29988169920. Its totient is φ = 14349135360.

The previous prime is 21043414523. The next prime is 21043414531. The reversal of 21043414525 is 52541434012.

It is not a de Polignac number, because 21043414525 - 2¹ = 21043414523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043414523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304564 + ... + 367213.

It is an arithmetic number, because the mean of its divisors is an integer number (1249507080).

Almost surely, 2^21043414525 is an apocalyptic number.

21043414525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21043414525 is a deficient number, since it is larger than the sum of its proper divisors (8944755395).

21043414525 is a wasteful number, since it uses less digits than its factorization.

21043414525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671973 (or 671968 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21043414525 its reverse (52541434012), we get a palindrome (73584848537).

The spelling of 21043414525 in words is "twenty-one billion, forty-three million, four hundred fourteen thousand, five hundred twenty-five".