21221123041 has 2 divisors, whose sum is σ = 21221123042. Its totient is φ = 21221123040.

The previous prime is 21221122987. The next prime is 21221123081. The reversal of 21221123041 is 14032112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15526156816 + 5694966225 = 124604^2 + 75465^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221123041 - 2¹⁹ = 21220598753 is a prime.

It is a super-2 number, since 2×21221123041² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21221123081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610561520 + 10610561521.

It is an arithmetic number, because the mean of its divisors is an integer number (10610561521).

Almost surely, 2^21221123041 is an apocalyptic number.

It is an amenable number.

21221123041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221123041 is an equidigital number, since it uses as much as digits as its factorization.

21221123041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21221123041 its reverse (14032112212), we get a palindrome (35253235253).

The spelling of 21221123041 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-three thousand, forty-one".