201021121001 has 2 divisors, whose sum is σ = 201021121002. Its totient is φ = 201021121000.

The previous prime is 201021120941. The next prime is 201021121033. The reversal of 201021121001 is 100121120102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200973786601 + 47334400 = 448301^2 + 6880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021121001 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510560500 + 100510560501.

It is an arithmetic number, because the mean of its divisors is an integer number (100510560501).

Almost surely, 2^201021121001 is an apocalyptic number.

It is an amenable number.

201021121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021121001 is an equidigital number, since it uses as much as digits as its factorization.

201021121001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201021121001 its reverse (100121120102), we get a palindrome (301142241103).

The spelling of 201021121001 in words is "two hundred one billion, twenty-one million, one hundred twenty-one thousand, one".