21114444371 has 2 divisors, whose sum is σ = 21114444372. Its totient is φ = 21114444370.

The previous prime is 21114444367. The next prime is 21114444443. The reversal of 21114444371 is 17344441112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21114444371 - 2² = 21114444367 is a prime.

It is a super-2 number, since 2×21114444371² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21114444331) 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, 10557222185 + 10557222186.

It is an arithmetic number, because the mean of its divisors is an integer number (10557222186).

Almost surely, 2^21114444371 is an apocalyptic number.

21114444371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114444371 is an equidigital number, since it uses as much as digits as its factorization.

21114444371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

Adding to 21114444371 its reverse (17344441112), we get a palindrome (38458885483).

The spelling of 21114444371 in words is "twenty-one billion, one hundred fourteen million, four hundred forty-four thousand, three hundred seventy-one".