21265222132 has 48 divisors (see below), whose sum is σ = 46446478848. Its totient is φ = 8276289120.

The previous prime is 21265222127. The next prime is 21265222151. The reversal of 21265222132 is 23122256212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21265222132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255223 + ... + 328129.

It is an arithmetic number, because the mean of its divisors is an integer number (967634976).

Almost surely, 2^21265222132 is an apocalyptic number.

21265222132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21265222132 is an abundant number, since it is smaller than the sum of its proper divisors (25181256716).

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

21265222132 is a wasteful number, since it uses less digits than its factorization.

21265222132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73876 (or 73874 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

Adding to 21265222132 its reverse (23122256212), we get a palindrome (44387478344).

The spelling of 21265222132 in words is "twenty-one billion, two hundred sixty-five million, two hundred twenty-two thousand, one hundred thirty-two".