621213441 has 4 divisors (see below), whose sum is σ = 828284592. Its totient is φ = 414142292.

The previous prime is 621213407. The next prime is 621213469. The reversal of 621213441 is 144312126.

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 621213441 - 2⁶ = 621213377 is a prime.

It is a super-2 number, since 2×621213441² = 771812278558120962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621213401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103535571 + ... + 103535576.

It is an arithmetic number, because the mean of its divisors is an integer number (207071148).

Almost surely, 2^621213441 is an apocalyptic number.

It is an amenable number.

621213441 is a deficient number, since it is larger than the sum of its proper divisors (207071151).

621213441 is a wasteful number, since it uses less digits than its factorization.

621213441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207071150.

The product of its digits is 1152, while the sum is 24.

The square root of 621213441 is about 24924.1537669787. The cubic root of 621213441 is about 853.2578279784.

Adding to 621213441 its reverse (144312126), we get a palindrome (765525567).

The spelling of 621213441 in words is "six hundred twenty-one million, two hundred thirteen thousand, four hundred forty-one".