21003331300021 has 16 divisors (see below), whose sum is σ = 24885860739840. Its totient is φ = 17344032048000.

The previous prime is 21003331299991. The next prime is 21003331300033. The reversal of 21003331300021 is 12000313330012.

It is not a de Polignac number, because 21003331300021 - 2⁵ = 21003331299989 is a prime.

It is a super-3 number, since 3×21003331300021³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003331300921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113107105 + ... + 113292646.

It is an arithmetic number, because the mean of its divisors is an integer number (1555366296240).

Almost surely, 2^{21003331300021} is an apocalyptic number.

It is an amenable number.

21003331300021 is a deficient number, since it is larger than the sum of its proper divisors (3882529439819).

21003331300021 is a wasteful number, since it uses less digits than its factorization.

21003331300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226400244.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21003331300021 its reverse (12000313330012), we get a palindrome (33003644630033).

The spelling of 21003331300021 in words is "twenty-one trillion, three billion, three hundred thirty-one million, three hundred thousand, twenty-one".