21001650023 has 2 divisors, whose sum is σ = 21001650024. Its totient is φ = 21001650022.

The previous prime is 21001650001. The next prime is 21001650067. The reversal of 21001650023 is 32005610012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001650023 - 2⁶ = 21001649959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001649977 and 21001650004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001650223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500825011 + 10500825012.

It is an arithmetic number, because the mean of its divisors is an integer number (10500825012).

Almost surely, 2^21001650023 is an apocalyptic number.

21001650023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001650023 is an equidigital number, since it uses as much as digits as its factorization.

21001650023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The spelling of 21001650023 in words is "twenty-one billion, one million, six hundred fifty thousand, twenty-three".