21321142334145 has 48 divisors (see below), whose sum is σ = 39489563290320. Its totient is φ = 10604190339072.

The previous prime is 21321142334137. The next prime is 21321142334197. The reversal of 21321142334145 is 54143324112312.

21321142334145 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 1 + 1 + 4 + 233 + 414 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 103704609024 + 21217437725121 = 322032^2 + 4606239^2 .

It is not a de Polignac number, because 21321142334145 - 2³ = 21321142334137 is a prime.

It is a super-2 number, since 2×21321142334145² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 127764204 + ... + 127930973.

It is an arithmetic number, because the mean of its divisors is an integer number (822699235215).

Almost surely, 2^{21321142334145} is an apocalyptic number.

It is an amenable number.

21321142334145 is a deficient number, since it is larger than the sum of its proper divisors (18168420956175).

21321142334145 is a wasteful number, since it uses less digits than its factorization.

21321142334145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255695314 (or 255695311 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 21321142334145 its reverse (54143324112312), we get a palindrome (75464466446457).

The spelling of 21321142334145 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred forty-two million, three hundred thirty-four thousand, one hundred forty-five".