201021220993 has 2 divisors, whose sum is σ = 201021220994. Its totient is φ = 201021220992.

The previous prime is 201021220963. The next prime is 201021221161. The reversal of 201021220993 is 399022120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187101232704 + 13919988289 = 432552^2 + 117983^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021220993 - 2¹³ = 201021212801 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021220963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510610496 + 100510610497.

It is an arithmetic number, because the mean of its divisors is an integer number (100510610497).

Almost surely, 2^201021220993 is an apocalyptic number.

It is an amenable number.

201021220993 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021220993 is an equidigital number, since it uses as much as digits as its factorization.

201021220993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 201021220993 in words is "two hundred one billion, twenty-one million, two hundred twenty thousand, nine hundred ninety-three".