621213 has 8 divisors (see below), whose sum is σ = 844128. Its totient is φ = 406224.

The previous prime is 621143. The next prime is 621217. The reversal of 621213 is 312126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621213 - 2⁸ = 620957 is a prime.

It is a super-3 number, since 3×621213³ = 719188710393331791, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621192 and 621201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1795 + ... + 2112.

It is an arithmetic number, because the mean of its divisors is an integer number (105516).

2⁶²¹²¹³ is an apocalyptic number.

It is an amenable number.

621213 is a deficient number, since it is larger than the sum of its proper divisors (222915).

621213 is a wasteful number, since it uses less digits than its factorization.

621213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963.

The product of its digits is 72, while the sum is 15.

The square root of 621213 is about 788.1706667975. The cubic root of 621213 is about 85.3257626069.

Adding to 621213 its reverse (312126), we get a palindrome (933339).

It can be divided in two parts, 62 and 1213, that added together give a triangular number (1275 = T₅₀).

The spelling of 621213 in words is "six hundred twenty-one thousand, two hundred thirteen".