21411405525 has 96 divisors (see below), whose sum is σ = 37682088192. Its totient is φ = 10705305600.

The previous prime is 21411405487. The next prime is 21411405551. The reversal of 21411405525 is 52550411412.

It is not a de Polignac number, because 21411405525 - 2⁹ = 21411405013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21411405492 and 21411405501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24303085 + ... + 24303965.

It is an arithmetic number, because the mean of its divisors is an integer number (392521752).

Almost surely, 2^21411405525 is an apocalyptic number.

21411405525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21411405525 is a deficient number, since it is larger than the sum of its proper divisors (16270682667).

21411405525 is a wasteful number, since it uses less digits than its factorization.

21411405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 21411405525 its reverse (52550411412), we get a palindrome (73961816937).

The spelling of 21411405525 in words is "twenty-one billion, four hundred eleven million, four hundred five thousand, five hundred twenty-five".