21233106651 has 8 divisors (see below), whose sum is σ = 29800851520. Its totient is φ = 13410383112.

The previous prime is 21233106647. The next prime is 21233106659. The reversal of 21233106651 is 15660133212.

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

It is not a de Polignac number, because 21233106651 - 2² = 21233106647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233106659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186255265 + ... + 186255378.

It is an arithmetic number, because the mean of its divisors is an integer number (3725106440).

Almost surely, 2^21233106651 is an apocalyptic number.

21233106651 is a deficient number, since it is larger than the sum of its proper divisors (8567744869).

21233106651 is a wasteful number, since it uses less digits than its factorization.

21233106651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372510665.

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 21233106651 its reverse (15660133212), we get a palindrome (36893239863).

The spelling of 21233106651 in words is "twenty-one billion, two hundred thirty-three million, one hundred six thousand, six hundred fifty-one".