21412215347 has 4 divisors (see below), whose sum is σ = 21475753416. Its totient is φ = 21348677280.

The previous prime is 21412215311. The next prime is 21412215373. The reversal of 21412215347 is 74351221412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21412215347 - 2⁶ = 21412215283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412215947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31768529 + ... + 31769202.

It is an arithmetic number, because the mean of its divisors is an integer number (5368938354).

Almost surely, 2^21412215347 is an apocalyptic number.

21412215347 is a deficient number, since it is larger than the sum of its proper divisors (63538069).

21412215347 is an equidigital number, since it uses as much as digits as its factorization.

21412215347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63538068.

The product of its digits is 13440, while the sum is 32.

Adding to 21412215347 its reverse (74351221412), we get a palindrome (95763436759).

The spelling of 21412215347 in words is "twenty-one billion, four hundred twelve million, two hundred fifteen thousand, three hundred forty-seven".