21003561403332 has 24 divisors (see below), whose sum is σ = 51139106026176. Its totient is φ = 6696787693728.

The previous prime is 21003561403289. The next prime is 21003561403369. The reversal of 21003561403332 is 23330416530012.

It is a super-2 number, since 2×21003561403332² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003561403293 and 21003561403302.

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, 38049929803 + ... + 38049930354.

It is an arithmetic number, because the mean of its divisors is an integer number (2130796084424).

Almost surely, 2^{21003561403332} is an apocalyptic number.

It is an amenable number.

21003561403332 is an abundant number, since it is smaller than the sum of its proper divisors (30135544622844).

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

21003561403332 is a wasteful number, since it uses less digits than its factorization.

21003561403332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76099860187 (or 76099860185 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

Adding to 21003561403332 its reverse (23330416530012), we get a palindrome (44333977933344).

The spelling of 21003561403332 in words is "twenty-one trillion, three billion, five hundred sixty-one million, four hundred three thousand, three hundred thirty-two".