21723209422 has 4 divisors (see below), whose sum is σ = 32584814136. Its totient is φ = 10861604710.

The previous prime is 21723209413. The next prime is 21723209491. The reversal of 21723209422 is 22490232712.

It is a happy number.

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, 5430802354 + ... + 5430802357.

It is an arithmetic number, because the mean of its divisors is an integer number (8146203534).

Almost surely, 2^21723209422 is an apocalyptic number.

21723209422 is a deficient number, since it is larger than the sum of its proper divisors (10861604714).

21723209422 is a wasteful number, since it uses less digits than its factorization.

21723209422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10861604713.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21723209422 in words is "twenty-one billion, seven hundred twenty-three million, two hundred nine thousand, four hundred twenty-two".