1621542133027 has 2 divisors, whose sum is σ = 1621542133028. Its totient is φ = 1621542133026.

The previous prime is 1621542133021. The next prime is 1621542133087. The reversal of 1621542133027 is 7203312451261.

It is a weak prime.

It is an emirp because it is prime and its reverse (7203312451261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1621542133027 - 2³ = 1621542133019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621542133021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810771066513 + 810771066514.

It is an arithmetic number, because the mean of its divisors is an integer number (810771066514).

Almost surely, 2^{1621542133027} is an apocalyptic number.

1621542133027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621542133027 is an equidigital number, since it uses as much as digits as its factorization.

1621542133027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 1621542133027 its reverse (7203312451261), we get a palindrome (8824854584288).

The spelling of 1621542133027 in words is "one trillion, six hundred twenty-one billion, five hundred forty-two million, one hundred thirty-three thousand, twenty-seven".