1201201021 has 2 divisors, whose sum is σ = 1201201022. Its totient is φ = 1201201020.

The previous prime is 1201201009. The next prime is 1201201073. The reversal of 1201201021 is 1201021021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008380025 + 192820996 = 31755^2 + 13886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201201021 - 2²⁷ = 1066983293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201200989 and 1201201007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201201121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600510 + 600600511.

It is an arithmetic number, because the mean of its divisors is an integer number (600600511).

Almost surely, 2^1201201021 is an apocalyptic number.

It is an amenable number.

1201201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201201021 is an equidigital number, since it uses as much as digits as its factorization.

1201201021 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.

The square root of 1201201021 is about 34658.3470609895. The cubic root of 1201201021 is about 1063.0129718790.

Adding to 1201201021 its reverse (1201021021), we get a palindrome (2402222042).

The spelling of 1201201021 in words is "one billion, two hundred one million, two hundred one thousand, twenty-one".