1621542133019 has 2 divisors, whose sum is σ = 1621542133020. Its totient is φ = 1621542133018.

The previous prime is 1621542133007. The next prime is 1621542133021. The reversal of 1621542133019 is 9103312451261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621542133019 is a prime.

It is a super-2 number, since 2×1621542133019² (a number of 25 digits) contains 22 as substring.

Together with 1621542133021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1621542133619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810771066509 + 810771066510.

It is an arithmetic number, because the mean of its divisors is an integer number (810771066510).

Almost surely, 2^{1621542133019} is an apocalyptic number.

1621542133019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621542133019 is an equidigital number, since it uses as much as digits as its factorization.

1621542133019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 1621542133019 in words is "one trillion, six hundred twenty-one billion, five hundred forty-two million, one hundred thirty-three thousand, nineteen".