621213423 has 4 divisors (see below), whose sum is σ = 828284568. Its totient is φ = 414142280.

The previous prime is 621213407. The next prime is 621213469. The reversal of 621213423 is 324312126.

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

It is a cyclic number.

It is not a de Polignac number, because 621213423 - 2⁴ = 621213407 is a prime.

It is a super-2 number, since 2×621213423² = 771812233830753858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621213393 and 621213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621213403) 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, 103535568 + ... + 103535573.

It is an arithmetic number, because the mean of its divisors is an integer number (207071142).

Almost surely, 2^621213423 is an apocalyptic number.

621213423 is a deficient number, since it is larger than the sum of its proper divisors (207071145).

621213423 is a wasteful number, since it uses less digits than its factorization.

621213423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207071144.

The product of its digits is 1728, while the sum is 24.

The square root of 621213423 is about 24924.1534058832. The cubic root of 621213423 is about 853.2578197372.

Adding to 621213423 its reverse (324312126), we get a palindrome (945525549).

The spelling of 621213423 in words is "six hundred twenty-one million, two hundred thirteen thousand, four hundred twenty-three".