21234543422 has 4 divisors (see below), whose sum is σ = 31851815136. Its totient is φ = 10617271710.

The previous prime is 21234543397. The next prime is 21234543457. The reversal of 21234543422 is 22434543212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308635854 + ... + 5308635857.

It is an arithmetic number, because the mean of its divisors is an integer number (7962953784).

Almost surely, 2^21234543422 is an apocalyptic number.

21234543422 is a deficient number, since it is larger than the sum of its proper divisors (10617271714).

21234543422 is a wasteful number, since it uses less digits than its factorization.

21234543422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617271713.

The product of its digits is 46080, while the sum is 32.

The spelling of 21234543422 in words is "twenty-one billion, two hundred thirty-four million, five hundred forty-three thousand, four hundred twenty-two".