21103232651 has 8 divisors (see below), whose sum is σ = 21376040400. Its totient is φ = 20831865120.

The previous prime is 21103232629. The next prime is 21103232663. The reversal of 21103232651 is 15623230112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21103232651 - 2¹⁸ = 21102970507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103232651.

It is not an unprimeable number, because it can be changed into a prime (21103232621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330545 + ... + 389186.

It is an arithmetic number, because the mean of its divisors is an integer number (2672005050).

Almost surely, 2^21103232651 is an apocalyptic number.

21103232651 is a deficient number, since it is larger than the sum of its proper divisors (272807749).

21103232651 is a wasteful number, since it uses less digits than its factorization.

21103232651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720109.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21103232651 its reverse (15623230112), we get a palindrome (36726462763).

The spelling of 21103232651 in words is "twenty-one billion, one hundred three million, two hundred thirty-two thousand, six hundred fifty-one".