21043212107 has 8 divisors (see below), whose sum is σ = 21286065696. Its totient is φ = 20800887552.

The previous prime is 21043212103. The next prime is 21043212109. The reversal of 21043212107 is 70121234012.

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 21043212107 - 2² = 21043212103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043212103) 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, 51968 + ... + 211629.

It is an arithmetic number, because the mean of its divisors is an integer number (2660758212).

Almost surely, 2^21043212107 is an apocalyptic number.

21043212107 is a deficient number, since it is larger than the sum of its proper divisors (242853589).

21043212107 is an equidigital number, since it uses as much as digits as its factorization.

21043212107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264517.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21043212107 its reverse (70121234012), we get a palindrome (91164446119).

The spelling of 21043212107 in words is "twenty-one billion, forty-three million, two hundred twelve thousand, one hundred seven".