21144100331 has 2 divisors, whose sum is σ = 21144100332. Its totient is φ = 21144100330.

The previous prime is 21144100291. The next prime is 21144100339. The reversal of 21144100331 is 13300144112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144100331 - 2¹⁰ = 21144099307 is a prime.

It is a super-2 number, since 2×21144100331² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21144100339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572050165 + 10572050166.

It is an arithmetic number, because the mean of its divisors is an integer number (10572050166).

Almost surely, 2^21144100331 is an apocalyptic number.

21144100331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144100331 is an equidigital number, since it uses as much as digits as its factorization.

21144100331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21144100331 its reverse (13300144112), we get a palindrome (34444244443).

The spelling of 21144100331 in words is "twenty-one billion, one hundred forty-four million, one hundred thousand, three hundred thirty-one".