21232121606 has 8 divisors (see below), whose sum is σ = 33232886064. Its totient is φ = 10154492920.

The previous prime is 21232121597. The next prime is 21232121623. The reversal of 21232121606 is 60612123212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230783885 + ... + 230783976.

It is an arithmetic number, because the mean of its divisors is an integer number (4154110758).

Almost surely, 2^21232121606 is an apocalyptic number.

21232121606 is a deficient number, since it is larger than the sum of its proper divisors (12000764458).

21232121606 is a wasteful number, since it uses less digits than its factorization.

21232121606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461567886.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21232121606 its reverse (60612123212), we get a palindrome (81844244818).

The spelling of 21232121606 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, six hundred six".