201010021021 has 2 divisors, whose sum is σ = 201010021022. Its totient is φ = 201010021020.

The previous prime is 201010020973. The next prime is 201010021057. The reversal of 201010021021 is 120120010102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199674922500 + 1335098521 = 446850^2 + 36539^2 .

It is a cyclic number.

It is not a de Polignac number, because 201010021021 - 2¹⁵ = 201009988253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201010020989 and 201010021007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201010021061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100505010510 + 100505010511.

It is an arithmetic number, because the mean of its divisors is an integer number (100505010511).

Almost surely, 2^201010021021 is an apocalyptic number.

It is an amenable number.

201010021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201010021021 is an equidigital number, since it uses as much as digits as its factorization.

201010021021 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 10.

Adding to 201010021021 its reverse (120120010102), we get a palindrome (321130031123).

The spelling of 201010021021 in words is "two hundred one billion, ten million, twenty-one thousand, twenty-one".