21421480476 has 48 divisors (see below), whose sum is σ = 54535985280. Its totient is φ = 6490336320.

The previous prime is 21421480429. The next prime is 21421480477. The reversal of 21421480476 is 67408412412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421480477) 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 15 ways as a sum of consecutive naturals, for example, 1565175 + ... + 1578801.

It is an arithmetic number, because the mean of its divisors is an integer number (1136166360).

Almost surely, 2^21421480476 is an apocalyptic number.

It is an amenable number.

21421480476 is an abundant number, since it is smaller than the sum of its proper divisors (33114504804).

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

21421480476 is a wasteful number, since it uses less digits than its factorization.

21421480476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25554 (or 25552 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

Adding to 21421480476 its reverse (67408412412), we get a palindrome (88829892888).

The spelling of 21421480476 in words is "twenty-one billion, four hundred twenty-one million, four hundred eighty thousand, four hundred seventy-six".