1201210122521 has 2 divisors, whose sum is σ = 1201210122522. Its totient is φ = 1201210122520.

The previous prime is 1201210122517. The next prime is 1201210122557. The reversal of 1201210122521 is 1252210121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846333761296 + 354876361225 = 919964^2 + 595715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201210122521 - 2² = 1201210122517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201210122493 and 1201210122502.

It is not a weakly prime, because it can be changed into another prime (1201210122821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605061260 + 600605061261.

It is an arithmetic number, because the mean of its divisors is an integer number (600605061261).

Almost surely, 2^{1201210122521} is an apocalyptic number.

It is an amenable number.

1201210122521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201210122521 is an equidigital number, since it uses as much as digits as its factorization.

1201210122521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 1201210122521 its reverse (1252210121021), we get a palindrome (2453420243542).

The spelling of 1201210122521 in words is "one trillion, two hundred one billion, two hundred ten million, one hundred twenty-two thousand, five hundred twenty-one".