21245103551 has 8 divisors (see below), whose sum is σ = 25063348224. Its totient is φ = 17622666360.

The previous prime is 21245103547. The next prime is 21245103571. The reversal of 21245103551 is 15530154212.

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 21245103551 - 2² = 21245103547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245103571) 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, 48951635 + ... + 48952068.

It is an arithmetic number, because the mean of its divisors is an integer number (3132918528).

Almost surely, 2^21245103551 is an apocalyptic number.

21245103551 is a deficient number, since it is larger than the sum of its proper divisors (3818244673).

21245103551 is an equidigital number, since it uses as much as digits as its factorization.

21245103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97903741.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 21245103551 its reverse (15530154212), we get a palindrome (36775257763).

The spelling of 21245103551 in words is "twenty-one billion, two hundred forty-five million, one hundred three thousand, five hundred fifty-one".