21432202020 has 96 divisors (see below), whose sum is σ = 67338311040. Its totient is φ = 5658652800.

The previous prime is 21432202019. The next prime is 21432202081. The reversal of 21432202020 is 2020223412.

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 = 21432201984 and 21432202002.

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, 141942 + ... + 251021.

It is an arithmetic number, because the mean of its divisors is an integer number (701440740).

Almost surely, 2^21432202020 is an apocalyptic number.

21432202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432202020 is an abundant number, since it is smaller than the sum of its proper divisors (45906109020).

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

21432202020 is a wasteful number, since it uses less digits than its factorization.

21432202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393082 (or 393074 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21432202020 its reverse (2020223412), we get a palindrome (23452425432).

The spelling of 21432202020 in words is "twenty-one billion, four hundred thirty-two million, two hundred two thousand, twenty".