621216123 has 8 divisors (see below), whose sum is σ = 903587136. Its totient is φ = 376494600.

The previous prime is 621216121. The next prime is 621216139. The reversal of 621216123 is 321612126.

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

It is not a de Polignac number, because 621216123 - 2¹ = 621216121 is a prime.

It is a super-2 number, since 2×621216123² = 771818942950302258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621216093 and 621216102.

It is not an unprimeable number, because it can be changed into a prime (621216121) 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 7 ways as a sum of consecutive naturals, for example, 9412333 + ... + 9412398.

It is an arithmetic number, because the mean of its divisors is an integer number (112948392).

Almost surely, 2^621216123 is an apocalyptic number.

621216123 is a deficient number, since it is larger than the sum of its proper divisors (282371013).

621216123 is a wasteful number, since it uses less digits than its factorization.

621216123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18824745.

The product of its digits is 864, while the sum is 24.

The square root of 621216123 is about 24924.2075701516. The cubic root of 621216123 is about 853.2590559161.

Adding to 621216123 its reverse (321612126), we get a palindrome (942828249).

The spelling of 621216123 in words is "six hundred twenty-one million, two hundred sixteen thousand, one hundred twenty-three".