21425214511 has 32 divisors (see below), whose sum is σ = 23201280000. Its totient is φ = 19723707360.

The previous prime is 21425214493. The next prime is 21425214527. The reversal of 21425214511 is 11541252412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21425214511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425214511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425914511) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 56530720 + ... + 56531098.

It is an arithmetic number, because the mean of its divisors is an integer number (725040000).

Almost surely, 2^21425214511 is an apocalyptic number.

21425214511 is a deficient number, since it is larger than the sum of its proper divisors (1776065489).

21425214511 is a wasteful number, since it uses less digits than its factorization.

21425214511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907.

The product of its digits is 3200, while the sum is 28.

Adding to 21425214511 its reverse (11541252412), we get a palindrome (32966466923).

The spelling of 21425214511 in words is "twenty-one billion, four hundred twenty-five million, two hundred fourteen thousand, five hundred eleven".