21331324041220 has 24 divisors (see below), whose sum is σ = 44799573057624. Its totient is φ = 8531807222016.

The previous prime is 21331324041199. The next prime is 21331324041283. The reversal of 21331324041220 is 2214042313312.

It can be written as a sum of positive squares in 4 ways, for example, as 7723252297476 + 13608071743744 = 2779074^2 + 3688912^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44907489 + ... + 45380008.

It is an arithmetic number, because the mean of its divisors is an integer number (1866648877401).

Almost surely, 2^{21331324041220} is an apocalyptic number.

21331324041220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331324041220 is an abundant number, since it is smaller than the sum of its proper divisors (23468249016404).

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

21331324041220 is a wasteful number, since it uses less digits than its factorization.

21331324041220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90299319 (or 90299317 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21331324041220 its reverse (2214042313312), we get a palindrome (23545366354532).

The spelling of 21331324041220 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twenty-four million, forty-one thousand, two hundred twenty".