16353386621 has 16 divisors (see below), whose sum is σ = 20223551040. Its totient is φ = 13000849920.

The previous prime is 16353386617. The next prime is 16353386629. The reversal of 16353386621 is 12668335361.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16353386621 - 2² = 16353386617 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16353386629) 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, 3006740 + ... + 3012173.

It is an arithmetic number, because the mean of its divisors is an integer number (1263971940).

Almost surely, 2^16353386621 is an apocalyptic number.

16353386621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16353386621 is a deficient number, since it is larger than the sum of its proper divisors (3870164419).

16353386621 is a wasteful number, since it uses less digits than its factorization.

16353386621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6018956.

The product of its digits is 466560, while the sum is 44.

The spelling of 16353386621 in words is "sixteen billion, three hundred fifty-three million, three hundred eighty-six thousand, six hundred twenty-one".