21332263251 has 8 divisors (see below), whose sum is σ = 30630942160. Its totient is φ = 13127546592.

The previous prime is 21332263217. The next prime is 21332263259. The reversal of 21332263251 is 15236223312.

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

It is not a de Polignac number, because 21332263251 - 2¹³ = 21332255059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21332263259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273490516 + ... + 273490593.

It is an arithmetic number, because the mean of its divisors is an integer number (3828867770).

Almost surely, 2^21332263251 is an apocalyptic number.

21332263251 is a deficient number, since it is larger than the sum of its proper divisors (9298678909).

21332263251 is a wasteful number, since it uses less digits than its factorization.

21332263251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546981125.

The product of its digits is 12960, while the sum is 30.

Adding to 21332263251 its reverse (15236223312), we get a palindrome (36568486563).

The spelling of 21332263251 in words is "twenty-one billion, three hundred thirty-two million, two hundred sixty-three thousand, two hundred fifty-one".