20100021983 has 2 divisors, whose sum is σ = 20100021984. Its totient is φ = 20100021982.

The previous prime is 20100021973. The next prime is 20100022009. The reversal of 20100021983 is 38912000102.

It is an a-pointer prime, because the next prime (20100022009) can be obtained adding 20100021983 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20100021983 - 2⁸ = 20100021727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100021923) 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, 10050010991 + 10050010992.

It is an arithmetic number, because the mean of its divisors is an integer number (10050010992).

Almost surely, 2^20100021983 is an apocalyptic number.

20100021983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100021983 is an equidigital number, since it uses as much as digits as its factorization.

20100021983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 20100021983 in words is "twenty billion, one hundred million, twenty-one thousand, nine hundred eighty-three".