21112121351 has 2 divisors, whose sum is σ = 21112121352. Its totient is φ = 21112121350.

The previous prime is 21112121269. The next prime is 21112121353. The reversal of 21112121351 is 15312121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112121351 - 2¹⁴ = 21112104967 is a prime.

Together with 21112121353, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112121353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556060675 + 10556060676.

It is an arithmetic number, because the mean of its divisors is an integer number (10556060676).

Almost surely, 2^21112121351 is an apocalyptic number.

21112121351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112121351 is an equidigital number, since it uses as much as digits as its factorization.

21112121351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 20.

Adding to 21112121351 its reverse (15312121112), we get a palindrome (36424242463).

The spelling of 21112121351 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, three hundred fifty-one".