478021421 has 4 divisors (see below), whose sum is σ = 478252992. Its totient is φ = 477789852.

The previous prime is 478021409. The next prime is 478021433. The reversal of 478021421 is 124120874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (478021409) and next prime (478021433).

It is a cyclic number.

It is not a de Polignac number, because 478021421 - 2¹⁴ = 478005037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478021321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112661 + ... + 116826.

It is an arithmetic number, because the mean of its divisors is an integer number (119563248).

Almost surely, 2^478021421 is an apocalyptic number.

It is an amenable number.

478021421 is a deficient number, since it is larger than the sum of its proper divisors (231571).

478021421 is a wasteful number, since it uses less digits than its factorization.

478021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231570.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 478021421 is about 21863.7009904545. The cubic root of 478021421 is about 781.8962306953.

The spelling of 478021421 in words is "four hundred seventy-eight million, twenty-one thousand, four hundred twenty-one".