21112426447 has 8 divisors (see below), whose sum is σ = 24133489952. Its totient is φ = 18092613600.

The previous prime is 21112426427. The next prime is 21112426487. The reversal of 21112426447 is 74462421112.

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 21112426447 - 2⁷ = 21112426319 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 (21112426427) 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, 276204 + ... + 344257.

It is an arithmetic number, because the mean of its divisors is an integer number (3016686244).

Almost surely, 2^21112426447 is an apocalyptic number.

21112426447 is a deficient number, since it is larger than the sum of its proper divisors (3021063505).

21112426447 is an equidigital number, since it uses as much as digits as its factorization.

21112426447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625329.

The product of its digits is 21504, while the sum is 34.

Adding to 21112426447 its reverse (74462421112), we get a palindrome (95574847559).

The spelling of 21112426447 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-six thousand, four hundred forty-seven".