21134221424321 has 16 divisors (see below), whose sum is σ = 21423808554624. Its totient is φ = 20845473310464.

The previous prime is 21134221424317. The next prime is 21134221424341. The reversal of 21134221424321 is 12342412243112.

It is a cyclic number.

It is not a de Polignac number, because 21134221424321 - 2² = 21134221424317 is a prime.

It is a super-2 number, since 2×21134221424321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134221424341) 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, 897903065 + ... + 897926601.

It is an arithmetic number, because the mean of its divisors is an integer number (1338988034664).

Almost surely, 2^{21134221424321} is an apocalyptic number.

It is an amenable number.

21134221424321 is a deficient number, since it is larger than the sum of its proper divisors (289587130303).

21134221424321 is a wasteful number, since it uses less digits than its factorization.

21134221424321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840.

The product of its digits is 18432, while the sum is 32.

Adding to 21134221424321 its reverse (12342412243112), we get a palindrome (33476633667433).

The spelling of 21134221424321 in words is "twenty-one trillion, one hundred thirty-four billion, two hundred twenty-one million, four hundred twenty-four thousand, three hundred twenty-one".