21154335423 has 8 divisors (see below), whose sum is σ = 30375456048. Its totient is φ = 13018052544.

The previous prime is 21154335379. The next prime is 21154335431. The reversal of 21154335423 is 32453345112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21154335423 - 2¹³ = 21154327231 is a prime.

It is a super-3 number, since 3×21154335423³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154334423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271209390 + ... + 271209467.

It is an arithmetic number, because the mean of its divisors is an integer number (3796932006).

Almost surely, 2^21154335423 is an apocalyptic number.

21154335423 is a deficient number, since it is larger than the sum of its proper divisors (9221120625).

21154335423 is a wasteful number, since it uses less digits than its factorization.

21154335423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542418873.

The product of its digits is 43200, while the sum is 33.

The spelling of 21154335423 in words is "twenty-one billion, one hundred fifty-four million, three hundred thirty-five thousand, four hundred twenty-three".