21222131212020 has 48 divisors (see below), whose sum is σ = 59631939057600. Its totient is φ = 5639237688576.

The previous prime is 21222131212013. The next prime is 21222131212063. The reversal of 21222131212020 is 2021213122212.

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, 624898545 + ... + 624932504.

It is an arithmetic number, because the mean of its divisors is an integer number (1242332063700).

Almost surely, 2^{21222131212020} is an apocalyptic number.

21222131212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222131212020 is an abundant number, since it is smaller than the sum of its proper divisors (38409807845580).

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

21222131212020 is a wasteful number, since it uses less digits than its factorization.

21222131212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249831344 (or 1249831342 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21222131212020 its reverse (2021213122212), we get a palindrome (23243344334232).

The spelling of 21222131212020 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred thirty-one million, two hundred twelve thousand, twenty".