21044023331 has 2 divisors, whose sum is σ = 21044023332. Its totient is φ = 21044023330.

The previous prime is 21044023327. The next prime is 21044023369. The reversal of 21044023331 is 13332044012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21044023331 - 2² = 21044023327 is a prime.

It is a super-2 number, since 2×21044023331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21044023297 and 21044023306.

It is not a weakly prime, because it can be changed into another prime (21044023381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522011665 + 10522011666.

It is an arithmetic number, because the mean of its divisors is an integer number (10522011666).

Almost surely, 2^21044023331 is an apocalyptic number.

21044023331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044023331 is an equidigital number, since it uses as much as digits as its factorization.

21044023331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21044023331 its reverse (13332044012), we get a palindrome (34376067343).

The spelling of 21044023331 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred thirty-one".