21603266103540 has 96 divisors (see below), whose sum is σ = 65993391636480. Its totient is φ = 5236740073600.

The previous prime is 21603266103511. The next prime is 21603266103547. The reversal of 21603266103540 is 4530166230612.

It is a super-2 number, since 2×21603266103540² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603266103547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7071241 + ... + 9654479.

It is an arithmetic number, because the mean of its divisors is an integer number (687431162880).

Almost surely, 2^{21603266103540} is an apocalyptic number.

21603266103540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21603266103540 is an abundant number, since it is smaller than the sum of its proper divisors (44390125532940).

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

21603266103540 is a wasteful number, since it uses less digits than its factorization.

21603266103540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595933 (or 2595931 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 21603266103540 in words is "twenty-one trillion, six hundred three billion, two hundred sixty-six million, one hundred three thousand, five hundred forty".