21311504041 has 2 divisors, whose sum is σ = 21311504042. Its totient is φ = 21311504040.

The previous prime is 21311504023. The next prime is 21311504051. The reversal of 21311504041 is 14040511312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14023296400 + 7288207641 = 118420^2 + 85371^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311504041 - 2⁵ = 21311504009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311504051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655752020 + 10655752021.

It is an arithmetic number, because the mean of its divisors is an integer number (10655752021).

Almost surely, 2^21311504041 is an apocalyptic number.

It is an amenable number.

21311504041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311504041 is an equidigital number, since it uses as much as digits as its factorization.

21311504041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The spelling of 21311504041 in words is "twenty-one billion, three hundred eleven million, five hundred four thousand, forty-one".