21366277633 has 2 divisors, whose sum is σ = 21366277634. Its totient is φ = 21366277632.

The previous prime is 21366277609. The next prime is 21366277649. The reversal of 21366277633 is 33677266312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17037558784 + 4328718849 = 130528^2 + 65793^2 .

It is a cyclic number.

It is not a de Polignac number, because 21366277633 - 2⁵ = 21366277601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21366277693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683138816 + 10683138817.

It is an arithmetic number, because the mean of its divisors is an integer number (10683138817).

Almost surely, 2^21366277633 is an apocalyptic number.

It is an amenable number.

21366277633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21366277633 is an equidigital number, since it uses as much as digits as its factorization.

21366277633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 46.

The spelling of 21366277633 in words is "twenty-one billion, three hundred sixty-six million, two hundred seventy-seven thousand, six hundred thirty-three".