123355306621 has 8 divisors (see below), whose sum is σ = 129852588320. Its totient is φ = 116858514672.

The previous prime is 123355306567. The next prime is 123355306663. The reversal of 123355306621 is 126603553321.

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

It is a cyclic number.

It is not a de Polignac number, because 123355306621 - 2¹¹ = 123355304573 is a prime.

It is a super-4 number, since 4×123355306621⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123355306681) 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, 467506 + ... + 682108.

It is an arithmetic number, because the mean of its divisors is an integer number (16231573540).

Almost surely, 2^123355306621 is an apocalyptic number.

It is an amenable number.

123355306621 is a deficient number, since it is larger than the sum of its proper divisors (6497281699).

123355306621 is a wasteful number, since it uses less digits than its factorization.

123355306621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244875.

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 123355306621 its reverse (126603553321), we get a palindrome (249958859942).

The spelling of 123355306621 in words is "one hundred twenty-three billion, three hundred fifty-five million, three hundred six thousand, six hundred twenty-one".