21006230351 has 2 divisors, whose sum is σ = 21006230352. Its totient is φ = 21006230350.

The previous prime is 21006230347. The next prime is 21006230407. The reversal of 21006230351 is 15303260012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21006230351 - 2² = 21006230347 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21006220351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10503115175 + 10503115176.

It is an arithmetic number, because the mean of its divisors is an integer number (10503115176).

Almost surely, 2^21006230351 is an apocalyptic number.

21006230351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21006230351 is an equidigital number, since it uses as much as digits as its factorization.

21006230351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21006230351 its reverse (15303260012), we get a palindrome (36309490363).

The spelling of 21006230351 in words is "twenty-one billion, six million, two hundred thirty thousand, three hundred fifty-one".