21142033441 has 2 divisors, whose sum is σ = 21142033442. Its totient is φ = 21142033440.

The previous prime is 21142033427. The next prime is 21142033487. The reversal of 21142033441 is 14433024112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10879533025 + 10262500416 = 104305^2 + 101304^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142033441 - 2⁷ = 21142033313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21142031441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571016720 + 10571016721.

It is an arithmetic number, because the mean of its divisors is an integer number (10571016721).

Almost surely, 2^21142033441 is an apocalyptic number.

It is an amenable number.

21142033441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142033441 is an equidigital number, since it uses as much as digits as its factorization.

21142033441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21142033441 its reverse (14433024112), we get a palindrome (35575057553).

The spelling of 21142033441 in words is "twenty-one billion, one hundred forty-two million, thirty-three thousand, four hundred forty-one".