21431423006 has 32 divisors (see below), whose sum is σ = 37935593472. Its totient is φ = 8886062880.

The previous prime is 21431422979. The next prime is 21431423009. The reversal of 21431423006 is 60032413412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431423009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2720285 + ... + 2728151.

It is an arithmetic number, because the mean of its divisors is an integer number (1185487296).

Almost surely, 2^21431423006 is an apocalyptic number.

21431423006 is a deficient number, since it is larger than the sum of its proper divisors (16504170466).

21431423006 is a wasteful number, since it uses less digits than its factorization.

21431423006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14184.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21431423006 its reverse (60032413412), we get a palindrome (81463836418).

The spelling of 21431423006 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, six".