1210201121021 has 2 divisors, whose sum is σ = 1210201121022. Its totient is φ = 1210201121020.

The previous prime is 1210201120957. The next prime is 1210201121023. The reversal of 1210201121021 is 1201211020121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799754604100 + 410446516921 = 894290^2 + 640661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210201121021 - 2⁶ = 1210201120957 is a prime.

It is a super-3 number, since 3×1210201121021³ (a number of 37 digits) contains 333 as substring.

Together with 1210201121023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210201120987 and 1210201121005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210201121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605100560510 + 605100560511.

It is an arithmetic number, because the mean of its divisors is an integer number (605100560511).

Almost surely, 2^{1210201121021} is an apocalyptic number.

It is an amenable number.

1210201121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210201121021 is an equidigital number, since it uses as much as digits as its factorization.

1210201121021 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 14.

Adding to 1210201121021 its reverse (1201211020121), we get a palindrome (2411412141142).

The spelling of 1210201121021 in words is "one trillion, two hundred ten billion, two hundred one million, one hundred twenty-one thousand, twenty-one".