21231554343 has 8 divisors (see below), whose sum is σ = 28355378688. Its totient is φ = 14131049784.

The previous prime is 21231554249. The next prime is 21231554347. The reversal of 21231554343 is 34345513212.

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

It is not a de Polignac number, because 21231554343 - 2⁸ = 21231554087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231554347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5827821 + ... + 5831462.

It is an arithmetic number, because the mean of its divisors is an integer number (3544422336).

Almost surely, 2^21231554343 is an apocalyptic number.

21231554343 is a deficient number, since it is larger than the sum of its proper divisors (7123824345).

21231554343 is a wasteful number, since it uses less digits than its factorization.

21231554343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11659893.

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

The spelling of 21231554343 in words is "twenty-one billion, two hundred thirty-one million, five hundred fifty-four thousand, three hundred forty-three".