21522201013640 has 32 divisors (see below), whose sum is σ = 49606048681560. Its totient is φ = 8398907712000.

The previous prime is 21522201013633. The next prime is 21522201013673. The reversal of 21522201013640 is 4631010222512.

It can be written as a sum of positive squares in 4 ways, for example, as 4841821771396 + 16680379242244 = 2200414^2 + 4084162^2 .

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, 6561645011 + ... + 6561648290.

Almost surely, 2^{21522201013640} is an apocalyptic number.

21522201013640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21522201013640 is an abundant number, since it is smaller than the sum of its proper divisors (28083847667920).

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

21522201013640 is a wasteful number, since it uses less digits than its factorization.

21522201013640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123293353 (or 13123293349 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21522201013640 in words is "twenty-one trillion, five hundred twenty-two billion, two hundred one million, thirteen thousand, six hundred forty".