21907422406 has 4 divisors (see below), whose sum is σ = 32861133612. Its totient is φ = 10953711202.

The previous prime is 21907422379. The next prime is 21907422413. The reversal of 21907422406 is 60422470912.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5476855600 + ... + 5476855603.

It is an arithmetic number, because the mean of its divisors is an integer number (8215283403).

Almost surely, 2^21907422406 is an apocalyptic number.

21907422406 is a deficient number, since it is larger than the sum of its proper divisors (10953711206).

21907422406 is a wasteful number, since it uses less digits than its factorization.

21907422406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10953711205.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21907422406 in words is "twenty-one billion, nine hundred seven million, four hundred twenty-two thousand, four hundred six".