201120121021 has 2 divisors, whose sum is σ = 201120121022. Its totient is φ = 201120121020.

The previous prime is 201120120991. The next prime is 201120121061. The reversal of 201120121021 is 120121021102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162078708100 + 39041412921 = 402590^2 + 197589^2 .

It is a cyclic number.

It is not a de Polignac number, because 201120121021 - 2⁵ = 201120120989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201120120992 and 201120121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201120121061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560060510 + 100560060511.

It is an arithmetic number, because the mean of its divisors is an integer number (100560060511).

Almost surely, 2^201120121021 is an apocalyptic number.

It is an amenable number.

201120121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201120121021 is an equidigital number, since it uses as much as digits as its factorization.

201120121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201120121021 its reverse (120121021102), we get a palindrome (321241142123).

The spelling of 201120121021 in words is "two hundred one billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".