21848511851 has 2 divisors, whose sum is σ = 21848511852. Its totient is φ = 21848511850.

The previous prime is 21848511847. The next prime is 21848511857. The reversal of 21848511851 is 15811584812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21848511851 - 2² = 21848511847 is a prime.

It is not a weakly prime, because it can be changed into another prime (21848511857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10924255925 + 10924255926.

It is an arithmetic number, because the mean of its divisors is an integer number (10924255926).

Almost surely, 2^21848511851 is an apocalyptic number.

21848511851 is a deficient number, since it is larger than the sum of its proper divisors (1).

21848511851 is an equidigital number, since it uses as much as digits as its factorization.

21848511851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102400, while the sum is 44.

The spelling of 21848511851 in words is "twenty-one billion, eight hundred forty-eight million, five hundred eleven thousand, eight hundred fifty-one".