1621327989397 has 8 divisors (see below), whose sum is σ = 1668623086944. Its totient is φ = 1574468791728.

The previous prime is 1621327989383. The next prime is 1621327989419. The reversal of 1621327989397 is 7939897231261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1621327989397 - 2¹⁵ = 1621327956629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621327981397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108967423 + ... + 108982300.

It is an arithmetic number, because the mean of its divisors is an integer number (208577885868).

Almost surely, 2^{1621327989397} is an apocalyptic number.

It is an amenable number.

1621327989397 is a deficient number, since it is larger than the sum of its proper divisors (47295097547).

1621327989397 is a wasteful number, since it uses less digits than its factorization.

1621327989397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217949939.

The product of its digits is 61725888, while the sum is 67.

The spelling of 1621327989397 in words is "one trillion, six hundred twenty-one billion, three hundred twenty-seven million, nine hundred eighty-nine thousand, three hundred ninety-seven".