621004213 has 4 divisors (see below), whose sum is σ = 621084460. Its totient is φ = 620923968.

The previous prime is 621004199. The next prime is 621004253. The reversal of 621004213 is 312400126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 329858244 + 291145969 = 18162^2 + 17063^2 .

It is a cyclic number.

It is not a de Polignac number, because 621004213 - 2²¹ = 618907061 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 (621004253) 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, 27108 + ... + 44461.

It is an arithmetic number, because the mean of its divisors is an integer number (155271115).

Almost surely, 2^621004213 is an apocalyptic number.

It is an amenable number.

621004213 is a deficient number, since it is larger than the sum of its proper divisors (80247).

621004213 is an equidigital number, since it uses as much as digits as its factorization.

621004213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80246.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 621004213 is about 24919.9561195440. The cubic root of 621004213 is about 853.1620232927.

Adding to 621004213 its reverse (312400126), we get a palindrome (933404339).

The spelling of 621004213 in words is "six hundred twenty-one million, four thousand, two hundred thirteen".