421421455278 has 12 divisors (see below), whose sum is σ = 913079819808. Its totient is φ = 140473818420.

The previous prime is 421421455271. The next prime is 421421455297. The reversal of 421421455278 is 872554124124.

421421455278 is a `hidden beast` number, since 4 + 2 + 1 + 4 + 21 + 4 + 552 + 78 = 666.

421421455278 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421421455271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11706151518 + ... + 11706151553.

It is an arithmetic number, because the mean of its divisors is an integer number (76089984984).

Almost surely, 2^421421455278 is an apocalyptic number.

421421455278 is an abundant number, since it is smaller than the sum of its proper divisors (491658364530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421421455278 is a wasteful number, since it uses less digits than its factorization.

421421455278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23412303079 (or 23412303076 counting only the distinct ones).

The product of its digits is 716800, while the sum is 45.

The spelling of 421421455278 in words is "four hundred twenty-one billion, four hundred twenty-one million, four hundred fifty-five thousand, two hundred seventy-eight".