21133214420 has 96 divisors (see below), whose sum is σ = 48081019392. Its totient is φ = 7772018688.

The previous prime is 21133214353. The next prime is 21133214449. The reversal of 21133214420 is 2441233112.

It is a super-2 number, since 2×21133214420² (a number of 21 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 12095987 + ... + 12097733.

It is an arithmetic number, because the mean of its divisors is an integer number (500843952).

Almost surely, 2^21133214420 is an apocalyptic number.

21133214420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21133214420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24040509696).

21133214420 is an abundant number, since it is smaller than the sum of its proper divisors (26947804972).

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

21133214420 is a wasteful number, since it uses less digits than its factorization.

21133214420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21133214420 its reverse (2441233112), we get a palindrome (23574447532).

The spelling of 21133214420 in words is "twenty-one billion, one hundred thirty-three million, two hundred fourteen thousand, four hundred twenty".