21132041420 has 96 divisors (see below), whose sum is σ = 53854512768. Its totient is φ = 6799491072.

The previous prime is 21132041419. The next prime is 21132041423. The reversal of 21132041420 is 2414023112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21132041392 and 21132041401.

It is not an unprimeable number, because it can be changed into a prime (21132041423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 827564 + ... + 852716.

It is an arithmetic number, because the mean of its divisors is an integer number (560984508).

Almost surely, 2^21132041420 is an apocalyptic number.

21132041420 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 21132041420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26927256384).

21132041420 is an abundant number, since it is smaller than the sum of its proper divisors (32722471348).

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

21132041420 is a wasteful number, since it uses less digits than its factorization.

21132041420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25539 (or 25537 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21132041420 its reverse (2414023112), we get a palindrome (23546064532).

The spelling of 21132041420 in words is "twenty-one billion, one hundred thirty-two million, forty-one thousand, four hundred twenty".