621322420 has 48 divisors (see below), whose sum is σ = 1392854400. Its totient is φ = 232122240.

The previous prime is 621322411. The next prime is 621322433. The reversal of 621322420 is 24223126.

It is a junction number, because it is equal to n+sod(n) for n = 621322391 and 621322400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15466 + ... + 38494.

It is an arithmetic number, because the mean of its divisors is an integer number (29017800).

Almost surely, 2^621322420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621322420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696427200).

621322420 is an abundant number, since it is smaller than the sum of its proper divisors (771531980).

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

621322420 is a wasteful number, since it uses less digits than its factorization.

621322420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23128 (or 23126 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 621322420 is about 24926.3398837455. The cubic root of 621322420 is about 853.3077205176.

Adding to 621322420 its reverse (24223126), we get a palindrome (645545546).

The spelling of 621322420 in words is "six hundred twenty-one million, three hundred twenty-two thousand, four hundred twenty".