1204151531021 has 2 divisors, whose sum is σ = 1204151531022. Its totient is φ = 1204151531020.

The previous prime is 1204151531003. The next prime is 1204151531123. The reversal of 1204151531021 is 1201351514021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002523590121 + 201627940900 = 1001261^2 + 449030^2 .

It is an emirp because it is prime and its reverse (1201351514021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1204151531021 - 2¹⁴ = 1204151514637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204151531321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602075765510 + 602075765511.

It is an arithmetic number, because the mean of its divisors is an integer number (602075765511).

Almost surely, 2^{1204151531021} is an apocalyptic number.

It is an amenable number.

1204151531021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204151531021 is an equidigital number, since it uses as much as digits as its factorization.

1204151531021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 1204151531021 in words is "one trillion, two hundred four billion, one hundred fifty-one million, five hundred thirty-one thousand, twenty-one".