21790006633 has 2 divisors, whose sum is σ = 21790006634. Its totient is φ = 21790006632.

The previous prime is 21790006597. The next prime is 21790006681. The reversal of 21790006633 is 33660009712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21378241369 + 411765264 = 146213^2 + 20292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21790006633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21790006592 and 21790006601.

It is not a weakly prime, because it can be changed into another prime (21790006033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10895003316 + 10895003317.

It is an arithmetic number, because the mean of its divisors is an integer number (10895003317).

Almost surely, 2^21790006633 is an apocalyptic number.

It is an amenable number.

21790006633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21790006633 is an equidigital number, since it uses as much as digits as its factorization.

21790006633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The spelling of 21790006633 in words is "twenty-one billion, seven hundred ninety million, six thousand, six hundred thirty-three".