21335318951 has 2 divisors, whose sum is σ = 21335318952. Its totient is φ = 21335318950.

The previous prime is 21335318887. The next prime is 21335318981. The reversal of 21335318951 is 15981353312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21335318951 - 2⁶ = 21335318887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21335318899 and 21335318908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21335318981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667659475 + 10667659476.

It is an arithmetic number, because the mean of its divisors is an integer number (10667659476).

Almost surely, 2^21335318951 is an apocalyptic number.

21335318951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335318951 is an equidigital number, since it uses as much as digits as its factorization.

21335318951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The spelling of 21335318951 in words is "twenty-one billion, three hundred thirty-five million, three hundred eighteen thousand, nine hundred fifty-one".