21406506762 has 16 divisors (see below), whose sum is σ = 43620806880. Its totient is φ = 7000870032.

The previous prime is 21406506721. The next prime is 21406506763. The reversal of 21406506762 is 26760560412.

It is a self number, because there is not a number n which added to its sum of digits gives 21406506762.

It is not an unprimeable number, because it can be changed into a prime (21406506763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33657712 + ... + 33658347.

It is an arithmetic number, because the mean of its divisors is an integer number (2726300430).

Almost surely, 2^21406506762 is an apocalyptic number.

21406506762 is an abundant number, since it is smaller than the sum of its proper divisors (22214300118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21406506762 is a wasteful number, since it uses less digits than its factorization.

21406506762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67316117.

The product of its (nonzero) digits is 120960, while the sum is 39.

It can be divided in two parts, 2140650 and 6762, that added together give a palindrome (2147412).

The spelling of 21406506762 in words is "twenty-one billion, four hundred six million, five hundred six thousand, seven hundred sixty-two".