21113983351 has 2 divisors, whose sum is σ = 21113983352. Its totient is φ = 21113983350.

The previous prime is 21113983349. The next prime is 21113983361. The reversal of 21113983351 is 15338931112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113983351 - 2¹ = 21113983349 is a prime.

Together with 21113983349, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21113983351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113983361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556991675 + 10556991676.

It is an arithmetic number, because the mean of its divisors is an integer number (10556991676).

Almost surely, 2^21113983351 is an apocalyptic number.

21113983351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113983351 is an equidigital number, since it uses as much as digits as its factorization.

21113983351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The spelling of 21113983351 in words is "twenty-one billion, one hundred thirteen million, nine hundred eighty-three thousand, three hundred fifty-one".