10201021993 has 2 divisors, whose sum is σ = 10201021994. Its totient is φ = 10201021992.

The previous prime is 10201021981. The next prime is 10201022011. The reversal of 10201021993 is 39912010201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10191306304 + 9715689 = 100952^2 + 3117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10201021993 is a prime.

It is not a weakly prime, because it can be changed into another prime (10201021973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100510996 + 5100510997.

It is an arithmetic number, because the mean of its divisors is an integer number (5100510997).

Almost surely, 2^10201021993 is an apocalyptic number.

It is an amenable number.

10201021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

10201021993 is an equidigital number, since it uses as much as digits as its factorization.

10201021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 10201021993 in words is "ten billion, two hundred one million, twenty-one thousand, nine hundred ninety-three".