21441031 has 2 divisors, whose sum is σ = 21441032. Its totient is φ = 21441030.

The previous prime is 21441011. The next prime is 21441089. The reversal of 21441031 is 13014412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21441031 - 2⁵ = 21440999 is a prime.

It is a super-2 number, since 2×21441031² = 919435620685922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21440996 and 21441014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21441001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720515 + 10720516.

It is an arithmetic number, because the mean of its divisors is an integer number (10720516).

Almost surely, 2^21441031 is an apocalyptic number.

21441031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441031 is an equidigital number, since it uses as much as digits as its factorization.

21441031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21441031 is about 4630.4460908211. The cubic root of 21441031 is about 277.8104352656.

Adding to 21441031 its reverse (13014412), we get a palindrome (34455443).

The spelling of 21441031 in words is "twenty-one million, four hundred forty-one thousand, thirty-one".