21151318183 has 2 divisors, whose sum is σ = 21151318184. Its totient is φ = 21151318182.

The previous prime is 21151318163. The next prime is 21151318207. The reversal of 21151318183 is 38181315112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21151318183 - 2³³ = 12561383591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21151318163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575659091 + 10575659092.

It is an arithmetic number, because the mean of its divisors is an integer number (10575659092).

Almost surely, 2^21151318183 is an apocalyptic number.

21151318183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21151318183 is an equidigital number, since it uses as much as digits as its factorization.

21151318183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

The spelling of 21151318183 in words is "twenty-one billion, one hundred fifty-one million, three hundred eighteen thousand, one hundred eighty-three".