21231545434 has 8 divisors (see below), whose sum is σ = 34742528928. Its totient is φ = 9650702460.

The previous prime is 21231545407. The next prime is 21231545473. The reversal of 21231545434 is 43454513212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21231545434.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482535102 + ... + 482535145.

It is an arithmetic number, because the mean of its divisors is an integer number (4342816116).

Almost surely, 2^21231545434 is an apocalyptic number.

21231545434 is a deficient number, since it is larger than the sum of its proper divisors (13510983494).

21231545434 is a wasteful number, since it uses less digits than its factorization.

21231545434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965070260.

The product of its digits is 57600, while the sum is 34.

It can be divided in two parts, 21231 and 545434, that added together give a palindrome (566665).

The spelling of 21231545434 in words is "twenty-one billion, two hundred thirty-one million, five hundred forty-five thousand, four hundred thirty-four".