1621542133087 has 2 divisors, whose sum is σ = 1621542133088. Its totient is φ = 1621542133086.

The previous prime is 1621542133027. The next prime is 1621542133091. The reversal of 1621542133087 is 7803312451261.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7803312451261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1621542133087 - 2¹¹ = 1621542131039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621542133007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810771066543 + 810771066544.

It is an arithmetic number, because the mean of its divisors is an integer number (810771066544).

Almost surely, 2^{1621542133087} is an apocalyptic number.

1621542133087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621542133087 is an equidigital number, since it uses as much as digits as its factorization.

1621542133087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 1621542133087 in words is "one trillion, six hundred twenty-one billion, five hundred forty-two million, one hundred thirty-three thousand, eighty-seven".