21253066631111 has 12 divisors (see below), whose sum is σ = 25634882112912. Its totient is φ = 17258129292384.

The previous prime is 21253066631107. The next prime is 21253066631113. The reversal of 21253066631111 is 11113666035212.

It is not a de Polignac number, because 21253066631111 - 2² = 21253066631107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253066631113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4205194670 + ... + 4205199723.

It is an arithmetic number, because the mean of its divisors is an integer number (2136240176076).

Almost surely, 2^{21253066631111} is an apocalyptic number.

21253066631111 is a deficient number, since it is larger than the sum of its proper divisors (4381815481801).

21253066631111 is an equidigital number, since it uses as much as digits as its factorization.

21253066631111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410394438 (or 8410394419 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 21253066631111 in words is "twenty-one trillion, two hundred fifty-three billion, sixty-six million, six hundred thirty-one thousand, one hundred eleven".