21122266193520 has 320 divisors, whose sum is σ = 66869065534464. Its totient is φ = 5514284113920.

The previous prime is 21122266193519. The next prime is 21122266193549. The reversal of 21122266193520 is 2539166222112.

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 63 ways as a sum of consecutive naturals, for example, 1961025735 + ... + 1961036505.

Almost surely, 2^{21122266193520} is an apocalyptic number.

21122266193520 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 21122266193520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33434532767232).

21122266193520 is an abundant number, since it is smaller than the sum of its proper divisors (45746799340944).

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

21122266193520 is a wasteful number, since it uses less digits than its factorization.

21122266193520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11680 (or 11674 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 21122266193520 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred sixty-six million, one hundred ninety-three thousand, five hundred twenty".