21003421040240 has 40 divisors (see below), whose sum is σ = 48848305957728. Its totient is φ = 8398727205120.

The previous prime is 21003421040227. The next prime is 21003421040279. The reversal of 21003421040240 is 4204012430012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21003421040240² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 41012852 + ... + 41521811.

Almost surely, 2^{21003421040240} is an apocalyptic number.

21003421040240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003421040240 is an abundant number, since it is smaller than the sum of its proper divisors (27844884917488).

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

21003421040240 is a wasteful number, since it uses less digits than its factorization.

21003421040240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82537857 (or 82537851 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21003421040240 its reverse (4204012430012), we get a palindrome (25207433470252).

The spelling of 21003421040240 in words is "twenty-one trillion, three billion, four hundred twenty-one million, forty thousand, two hundred forty".