21310050577 has 2 divisors, whose sum is σ = 21310050578. Its totient is φ = 21310050576.

The previous prime is 21310050527. The next prime is 21310050617. The reversal of 21310050577 is 77505001312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18845523841 + 2464526736 = 137279^2 + 49644^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310050577 - 2¹⁵ = 21310017809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310050527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655025288 + 10655025289.

It is an arithmetic number, because the mean of its divisors is an integer number (10655025289).

Almost surely, 2^21310050577 is an apocalyptic number.

It is an amenable number.

21310050577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310050577 is an equidigital number, since it uses as much as digits as its factorization.

21310050577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 31.

Adding to 21310050577 its reverse (77505001312), we get a palindrome (98815051889).

The spelling of 21310050577 in words is "twenty-one billion, three hundred ten million, fifty thousand, five hundred seventy-seven".