21003133120 has 56 divisors (see below), whose sum is σ = 50044983984. Its totient is φ = 8396000256.

The previous prime is 21003133111. The next prime is 21003133153. The reversal of 21003133120 is 2133130012.

It is a super-2 number, since 2×21003133120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21003133094 and 21003133103.

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, 513754 + ... + 553126.

Almost surely, 2^21003133120 is an apocalyptic number.

21003133120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003133120 is an abundant number, since it is smaller than the sum of its proper divisors (29041850864).

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

21003133120 is a wasteful number, since it uses less digits than its factorization.

21003133120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41057 (or 41047 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21003133120 its reverse (2133130012), we get a palindrome (23136263132).

The spelling of 21003133120 in words is "twenty-one billion, three million, one hundred thirty-three thousand, one hundred twenty".