21251430312011 has 8 divisors (see below), whose sum is σ = 22175462733984. Its totient is φ = 20327402656000.

The previous prime is 21251430311981. The next prime is 21251430312019. The reversal of 21251430312011 is 11021303415212.

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 21251430312011 - 2¹⁰ = 21251430310987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21251430312019) 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, 10263761 + ... + 12159261.

It is an arithmetic number, because the mean of its divisors is an integer number (2771932841748).

Almost surely, 2^{21251430312011} is an apocalyptic number.

21251430312011 is a deficient number, since it is larger than the sum of its proper divisors (924032421973).

21251430312011 is a wasteful number, since it uses less digits than its factorization.

21251430312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382981.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21251430312011 its reverse (11021303415212), we get a palindrome (32272733727223).

The spelling of 21251430312011 in words is "twenty-one trillion, two hundred fifty-one billion, four hundred thirty million, three hundred twelve thousand, eleven".