21220221210984 has 192 divisors, whose sum is σ = 60071072256000. Its totient is φ = 6758789990400.

The previous prime is 21220221210967. The next prime is 21220221211043. The reversal of 21220221210984 is 48901212202212.

It is a happy number.

21220221210984 is a `hidden beast` number, since 212 + 2 + 0 + 221 + 210 + 9 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106235797 + ... + 106435355.

It is an arithmetic number, because the mean of its divisors is an integer number (312870168000).

Almost surely, 2^{21220221210984} is an apocalyptic number.

21220221210984 is a gapful number since it is divisible by the number (24) 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 21220221210984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30035536128000).

21220221210984 is an abundant number, since it is smaller than the sum of its proper divisors (38850851045016).

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

21220221210984 is a wasteful number, since it uses less digits than its factorization.

21220221210984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200128 (or 200121 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 21220221210984 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, nine hundred eighty-four".