21132434020 has 96 divisors (see below), whose sum is σ = 47397353472. Its totient is φ = 7900800000.

The previous prime is 21132433943. The next prime is 21132434023. The reversal of 21132434020 is 2043423112.

It is a junction number, because it is equal to n+sod(n) for n = 21132433982 and 21132434000.

It is not an unprimeable number, because it can be changed into a prime (21132434023) 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 31 ways as a sum of consecutive naturals, for example, 2563305 + ... + 2571535.

It is an arithmetic number, because the mean of its divisors is an integer number (493722432).

Almost surely, 2^21132434020 is an apocalyptic number.

21132434020 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 21132434020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23698676736).

21132434020 is an abundant number, since it is smaller than the sum of its proper divisors (26264919452).

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

21132434020 is a wasteful number, since it uses less digits than its factorization.

21132434020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8413 (or 8411 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21132434020 its reverse (2043423112), we get a palindrome (23175857132).

The spelling of 21132434020 in words is "twenty-one billion, one hundred thirty-two million, four hundred thirty-four thousand, twenty".