21154112343 has 96 divisors (see below), whose sum is σ = 39137978880. Its totient is φ = 10712943360.

The previous prime is 21154112341. The next prime is 21154112363. The reversal of 21154112343 is 34321145112.

21154112343 is a `hidden beast` number, since 2 + 1 + 15 + 411 + 234 + 3 = 666.

It is not a de Polignac number, because 21154112343 - 2¹ = 21154112341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154112341) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2072713 + ... + 2082893.

It is an arithmetic number, because the mean of its divisors is an integer number (407687280).

Almost surely, 2^21154112343 is an apocalyptic number.

21154112343 is a deficient number, since it is larger than the sum of its proper divisors (17983866537).

21154112343 is a wasteful number, since it uses less digits than its factorization.

21154112343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10309 (or 10306 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 21154112343 its reverse (34321145112), we get a palindrome (55475257455).

The spelling of 21154112343 in words is "twenty-one billion, one hundred fifty-four million, one hundred twelve thousand, three hundred forty-three".