305555861421 has 24 divisors (see below), whose sum is σ = 455652813824. Its totient is φ = 197108160480.

The previous prime is 305555861389. The next prime is 305555861437. The reversal of 305555861421 is 124168555503.

305555861421 is a `hidden beast` number, since 3 + 0 + 5 + 5 + 5 + 5 + 8 + 614 + 21 = 666.

305555861421 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 305555861421 - 2⁵ = 305555861389 is a prime.

It is a super-2 number, since 2×305555861421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305555841421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2314815 + ... + 2443251.

Almost surely, 2^305555861421 is an apocalyptic number.

305555861421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

305555861421 is a deficient number, since it is larger than the sum of its proper divisors (150096952403).

305555861421 is a wasteful number, since it uses less digits than its factorization.

305555861421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137001 (or 136998 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The spelling of 305555861421 in words is "three hundred five billion, five hundred fifty-five million, eight hundred sixty-one thousand, four hundred twenty-one".