21602221533444 has 72 divisors (see below), whose sum is σ = 56362744147360. Its totient is φ = 6420474491904.

The previous prime is 21602221533443. The next prime is 21602221533481. The reversal of 21602221533444 is 44433512220612.

It is a super-2 number, since 2×21602221533444² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21602221533443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163855537 + ... + 163987320.

Almost surely, 2^{21602221533444} is an apocalyptic number.

It is an amenable number.

21602221533444 is an abundant number, since it is smaller than the sum of its proper divisors (34760522613916).

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

21602221533444 is a wasteful number, since it uses less digits than its factorization.

21602221533444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327842917 (or 327842898 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 21602221533444 in words is "twenty-one trillion, six hundred two billion, two hundred twenty-one million, five hundred thirty-three thousand, four hundred forty-four".