21101308247 has 8 divisors (see below), whose sum is σ = 21267966720. Its totient is φ = 20934862200.

The previous prime is 21101308231. The next prime is 21101308271. The reversal of 21101308247 is 74280310112.

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 21101308247 - 2⁴ = 21101308231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101302247) 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, 149378 + ... + 254000.

It is an arithmetic number, because the mean of its divisors is an integer number (2658495840).

Almost surely, 2^21101308247 is an apocalyptic number.

21101308247 is a deficient number, since it is larger than the sum of its proper divisors (166658473).

21101308247 is a wasteful number, since it uses less digits than its factorization.

21101308247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106213.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 21101308247 its reverse (74280310112), we get a palindrome (95381618359).

The spelling of 21101308247 in words is "twenty-one billion, one hundred one million, three hundred eight thousand, two hundred forty-seven".