421621405455 has 16 divisors (see below), whose sum is σ = 675230084064. Its totient is φ = 224652804480.

The previous prime is 421621405417. The next prime is 421621405481. The reversal of 421621405455 is 554504126124.

It is not a de Polignac number, because 421621405455 - 2⁶ = 421621405391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13230124 + ... + 13261953.

It is an arithmetic number, because the mean of its divisors is an integer number (42201880254).

Almost surely, 2^421621405455 is an apocalyptic number.

421621405455 is a deficient number, since it is larger than the sum of its proper divisors (253608678609).

421621405455 is a wasteful number, since it uses less digits than its factorization.

421621405455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26493146.

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 421621405455 in words is "four hundred twenty-one billion, six hundred twenty-one million, four hundred five thousand, four hundred fifty-five".