621221106 has 48 divisors (see below), whose sum is σ = 1439854560. Its totient is φ = 177169920.

The previous prime is 621221101. The next prime is 621221147. The reversal of 621221106 is 601122126.

It is not an unprimeable number, because it can be changed into a prime (621221101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2790 + ... + 35358.

It is an arithmetic number, because the mean of its divisors is an integer number (29996970).

Almost surely, 2^621221106 is an apocalyptic number.

621221106 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621221106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (719927280).

621221106 is an abundant number, since it is smaller than the sum of its proper divisors (818633454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621221106 is a wasteful number, since it uses less digits than its factorization.

621221106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32619 (or 32602 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 621221106 is about 24924.3075330088. The cubic root of 621221106 is about 853.2613373435.

The spelling of 621221106 in words is "six hundred twenty-one million, two hundred twenty-one thousand, one hundred six".