21222003153620 has 24 divisors (see below), whose sum is σ = 44567395459944. Its totient is φ = 8488574816256.

The previous prime is 21222003153551. The next prime is 21222003153667. The reversal of 21222003153620 is 2635130022212.

It can be written as a sum of positive squares in 4 ways, for example, as 18538456336 + 21203464697284 = 136156^2 + 4604722^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13383317 + ... + 14884796.

It is an arithmetic number, because the mean of its divisors is an integer number (1856974810831).

Almost surely, 2^{21222003153620} is an apocalyptic number.

21222003153620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222003153620 is an abundant number, since it is smaller than the sum of its proper divisors (23345392306324).

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

21222003153620 is a wasteful number, since it uses less digits than its factorization.

21222003153620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28305659 (or 28305657 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21222003153620 its reverse (2635130022212), we get a palindrome (23857133175832).

The spelling of 21222003153620 in words is "twenty-one trillion, two hundred twenty-two billion, three million, one hundred fifty-three thousand, six hundred twenty".