21112623451 has 2 divisors, whose sum is σ = 21112623452. Its totient is φ = 21112623450.

The previous prime is 21112623407. The next prime is 21112623457. The reversal of 21112623451 is 15432621112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112623451 - 2¹³ = 21112615259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112623457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556311725 + 10556311726.

It is an arithmetic number, because the mean of its divisors is an integer number (10556311726).

Almost surely, 2^21112623451 is an apocalyptic number.

21112623451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112623451 is an equidigital number, since it uses as much as digits as its factorization.

21112623451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The spelling of 21112623451 in words is "twenty-one billion, one hundred twelve million, six hundred twenty-three thousand, four hundred fifty-one".