1621114536221 has 16 divisors (see below), whose sum is σ = 1712856983040. Its totient is φ = 1531767807360.

The previous prime is 1621114536211. The next prime is 1621114536229. The reversal of 1621114536221 is 1226354111261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1621114536221 - 2³⁰ = 1620040794397 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 (1621114536229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16206641 + ... + 16306361.

It is an arithmetic number, because the mean of its divisors is an integer number (107053561440).

Almost surely, 2^{1621114536221} is an apocalyptic number.

It is an amenable number.

1621114536221 is a deficient number, since it is larger than the sum of its proper divisors (91742446819).

1621114536221 is a wasteful number, since it uses less digits than its factorization.

1621114536221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111724.

The product of its digits is 17280, while the sum is 35.

Adding to 1621114536221 its reverse (1226354111261), we get a palindrome (2847468647482).

The spelling of 1621114536221 in words is "one trillion, six hundred twenty-one billion, one hundred fourteen million, five hundred thirty-six thousand, two hundred twenty-one".