621033421 has 4 divisors (see below), whose sum is σ = 624752352. Its totient is φ = 617314492.

The previous prime is 621033407. The next prime is 621033461. The reversal of 621033421 is 124330126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621033421 - 2¹⁹ = 620509133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621033392 and 621033401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621033401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859215 + ... + 1859548.

It is an arithmetic number, because the mean of its divisors is an integer number (156188088).

Almost surely, 2^621033421 is an apocalyptic number.

It is an amenable number.

621033421 is a deficient number, since it is larger than the sum of its proper divisors (3718931).

621033421 is a wasteful number, since it uses less digits than its factorization.

621033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718930.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 621033421 is about 24920.5421489983. The cubic root of 621033421 is about 853.1753988143.

Adding to 621033421 its reverse (124330126), we get a palindrome (745363547).

The spelling of 621033421 in words is "six hundred twenty-one million, thirty-three thousand, four hundred twenty-one".