21050056633 has 2 divisors, whose sum is σ = 21050056634. Its totient is φ = 21050056632.

The previous prime is 21050056597. The next prime is 21050056649. The reversal of 21050056633 is 33665005012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17718804544 + 3331252089 = 133112^2 + 57717^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050056633 - 2⁹ = 21050056121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21050056595 and 21050056604.

It is not a weakly prime, because it can be changed into another prime (21050056663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525028316 + 10525028317.

It is an arithmetic number, because the mean of its divisors is an integer number (10525028317).

Almost surely, 2^21050056633 is an apocalyptic number.

It is an amenable number.

21050056633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050056633 is an equidigital number, since it uses as much as digits as its factorization.

21050056633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The spelling of 21050056633 in words is "twenty-one billion, fifty million, fifty-six thousand, six hundred thirty-three".