21132070020 has 96 divisors (see below), whose sum is σ = 65822198400. Its totient is φ = 5628534912.

The previous prime is 21132070007. The next prime is 21132070039. The reversal of 21132070020 is 2007023112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21132069975 and 21132070002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441082 + ... + 486638.

It is an arithmetic number, because the mean of its divisors is an integer number (685647900).

Almost surely, 2^21132070020 is an apocalyptic number.

21132070020 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 21132070020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32911099200).

21132070020 is an abundant number, since it is smaller than the sum of its proper divisors (44690128380).

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

21132070020 is a wasteful number, since it uses less digits than its factorization.

21132070020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46434 (or 46426 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

Adding to 21132070020 its reverse (2007023112), we get a palindrome (23139093132).

The spelling of 21132070020 in words is "twenty-one billion, one hundred thirty-two million, seventy thousand, twenty".