21000021021133 has 16 divisors (see below), whose sum is σ = 26181979355520. Its totient is φ = 16363568390400.

The previous prime is 21000021021131. The next prime is 21000021021137. The reversal of 21000021021133 is 33112012000012.

It is not a de Polignac number, because 21000021021133 - 2¹ = 21000021021131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000021021131) 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, 17308753 + ... + 18482233.

It is an arithmetic number, because the mean of its divisors is an integer number (1636373709720).

Almost surely, 2^{21000021021133} is an apocalyptic number.

It is an amenable number.

21000021021133 is a deficient number, since it is larger than the sum of its proper divisors (5181958334387).

21000021021133 is a wasteful number, since it uses less digits than its factorization.

21000021021133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405908.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21000021021133 its reverse (33112012000012), we get a palindrome (54112033021145).

The spelling of 21000021021133 in words is "twenty-one trillion, twenty-one million, twenty-one thousand, one hundred thirty-three".