1201210001021 has 2 divisors, whose sum is σ = 1201210001022. Its totient is φ = 1201210001020.

The previous prime is 1201210001003. The next prime is 1201210001053. The reversal of 1201210001021 is 1201000121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644470178521 + 556739822500 = 802789^2 + 746150^2 .

It is an emirp because it is prime and its reverse (1201000121021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201210001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201210000993 and 1201210001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201210001081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605000510 + 600605000511.

It is an arithmetic number, because the mean of its divisors is an integer number (600605000511).

Almost surely, 2^{1201210001021} is an apocalyptic number.

It is an amenable number.

1201210001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201210001021 is an equidigital number, since it uses as much as digits as its factorization.

1201210001021 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 1201210001021 its reverse (1201000121021), we get a palindrome (2402210122042).

The spelling of 1201210001021 in words is "one trillion, two hundred one billion, two hundred ten million, one thousand, twenty-one".