420860421 has 8 divisors (see below), whose sum is σ = 623496960. Its totient is φ = 280573596.

The previous prime is 420860353. The next prime is 420860437. The reversal of 420860421 is 124068024.

It is not a de Polignac number, because 420860421 - 2¹⁴ = 420844037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15587423 = 420860421 / (4 + 2 + 0 + 8 + 6 + 0 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420860471) 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, 7793685 + ... + 7793738.

It is an arithmetic number, because the mean of its divisors is an integer number (77937120).

Almost surely, 2^420860421 is an apocalyptic number.

It is an amenable number.

420860421 is a deficient number, since it is larger than the sum of its proper divisors (202636539).

420860421 is a wasteful number, since it uses less digits than its factorization.

420860421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15587432 (or 15587426 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 420860421 is about 20514.8829146062. The cubic root of 420860421 is about 749.3982853818.

The spelling of 420860421 in words is "four hundred twenty million, eight hundred sixty thousand, four hundred twenty-one".