621213424 has 80 divisors (see below), whose sum is σ = 1357225632. Its totient is φ = 273521664.

The previous prime is 621213407. The next prime is 621213469. The reversal of 621213424 is 424312126.

It is a happy number.

621213424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621213424² = 771812236315607552, which contains 22 as substring.

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, 407127 + ... + 408649.

Almost surely, 2^621213424 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 621213424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678612816).

621213424 is an abundant number, since it is smaller than the sum of its proper divisors (736012208).

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

621213424 is a wasteful number, since it uses less digits than its factorization.

621213424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1628 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 621213424 is about 24924.1534259441. The cubic root of 621213424 is about 853.2578201951.

The spelling of 621213424 in words is "six hundred twenty-one million, two hundred thirteen thousand, four hundred twenty-four".