621041220 has 144 divisors (see below), whose sum is σ = 2001767040. Its totient is φ = 155409408.

The previous prime is 621041209. The next prime is 621041231. The reversal of 621041220 is 22140126.

621041220 is a `hidden beast` number, since 621 + 0 + 41 + 2 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (621041209) and next prime (621041231).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 621041193 and 621041202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 385657 + ... + 387263.

It is an arithmetic number, because the mean of its divisors is an integer number (13901160).

Almost surely, 2^621041220 is an apocalyptic number.

621041220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621041220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000883520).

621041220 is an abundant number, since it is smaller than the sum of its proper divisors (1380725820).

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

621041220 is a wasteful number, since it uses less digits than its factorization.

621041220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1749 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 621041220 is about 24920.6986258411. The cubic root of 621041220 is about 853.1789702201.

Adding to 621041220 its reverse (22140126), we get a palindrome (643181346).

The spelling of 621041220 in words is "six hundred twenty-one million, forty-one thousand, two hundred twenty".