21432022420 has 48 divisors (see below), whose sum is σ = 47396764800. Its totient is φ = 8118057600.

The previous prime is 21432022397. The next prime is 21432022433. The reversal of 21432022420 is 2422023412.

It is a super-2 number, since 2×21432022420² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21432022391 and 21432022400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 958326 + ... + 980434.

It is an arithmetic number, because the mean of its divisors is an integer number (987432600).

Almost surely, 2^21432022420 is an apocalyptic number.

21432022420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432022420 is an abundant number, since it is smaller than the sum of its proper divisors (25964742380).

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

21432022420 is a wasteful number, since it uses less digits than its factorization.

21432022420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24688 (or 24686 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21432022420 its reverse (2422023412), we get a palindrome (23854045832).

The spelling of 21432022420 in words is "twenty-one billion, four hundred thirty-two million, twenty-two thousand, four hundred twenty".