621124221 has 8 divisors (see below), whose sum is σ = 828809344. Its totient is φ = 413760960.

The previous prime is 621124213. The next prime is 621124241. The reversal of 621124221 is 122421126.

621124221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 621124221 - 2³ = 621124213 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 (621124241) 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, 75925 + ... + 83706.

It is an arithmetic number, because the mean of its divisors is an integer number (103601168).

Almost surely, 2^621124221 is an apocalyptic number.

It is an amenable number.

621124221 is a deficient number, since it is larger than the sum of its proper divisors (207685123).

621124221 is a wasteful number, since it uses less digits than its factorization.

621124221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160931.

The product of its digits is 384, while the sum is 21.

The square root of 621124221 is about 24922.3638726346. The cubic root of 621124221 is about 853.2169771193.

Adding to 621124221 its reverse (122421126), we get a palindrome (743545347).

The spelling of 621124221 in words is "six hundred twenty-one million, one hundred twenty-four thousand, two hundred twenty-one".