621221109 has 8 divisors (see below), whose sum is σ = 843923232. Its totient is φ = 406333200.

The previous prime is 621221101. The next prime is 621221147. The reversal of 621221109 is 901122126.

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

It is not a de Polignac number, because 621221109 - 2³ = 621221101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621221101) 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, 1953367 + ... + 1953684.

It is an arithmetic number, because the mean of its divisors is an integer number (105490404).

Almost surely, 2^621221109 is an apocalyptic number.

It is an amenable number.

621221109 is a deficient number, since it is larger than the sum of its proper divisors (222702123).

621221109 is a wasteful number, since it uses less digits than its factorization.

621221109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907107.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 621221109 is about 24924.3075931910. The cubic root of 621221109 is about 853.2613387171.

The spelling of 621221109 in words is "six hundred twenty-one million, two hundred twenty-one thousand, one hundred nine".