21234412020 has 192 divisors, whose sum is σ = 63855267840. Its totient is φ = 5253629952.

The previous prime is 21234412019. The next prime is 21234412033. The reversal of 21234412020 is 2021443212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37716259 + ... + 37716821.

It is an arithmetic number, because the mean of its divisors is an integer number (332579520).

Almost surely, 2^21234412020 is an apocalyptic number.

21234412020 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 21234412020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31927633920).

21234412020 is an abundant number, since it is smaller than the sum of its proper divisors (42620855820).

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

21234412020 is a wasteful number, since it uses less digits than its factorization.

21234412020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21234412020 its reverse (2021443212), we get a palindrome (23255855232).

The spelling of 21234412020 in words is "twenty-one billion, two hundred thirty-four million, four hundred twelve thousand, twenty".