21232465406 has 4 divisors (see below), whose sum is σ = 31848698112. Its totient is φ = 10616232702.

The previous prime is 21232465357. The next prime is 21232465427. The reversal of 21232465406 is 60456423212.

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, 5308116350 + ... + 5308116353.

It is an arithmetic number, because the mean of its divisors is an integer number (7962174528).

Almost surely, 2^21232465406 is an apocalyptic number.

21232465406 is a deficient number, since it is larger than the sum of its proper divisors (10616232706).

21232465406 is a wasteful number, since it uses less digits than its factorization.

21232465406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10616232705.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 21232465406 its reverse (60456423212), we get a palindrome (81688888618).

The spelling of 21232465406 in words is "twenty-one billion, two hundred thirty-two million, four hundred sixty-five thousand, four hundred six".