421022421 has 32 divisors (see below), whose sum is σ = 634233600. Its totient is φ = 275996160.

The previous prime is 421022411. The next prime is 421022431. The reversal of 421022421 is 124220124.

421022421 is a `hidden beast` number, since 421 + 0 + 2 + 242 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (421022411) and next prime (421022431).

It is not a de Polignac number, because 421022421 - 2¹⁷ = 420891349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421022394 and 421022403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421022411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578760 + ... + 579486.

It is an arithmetic number, because the mean of its divisors is an integer number (19819800).

Almost surely, 2^421022421 is an apocalyptic number.

It is an amenable number.

421022421 is a deficient number, since it is larger than the sum of its proper divisors (213211179).

421022421 is a wasteful number, since it uses less digits than its factorization.

421022421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 421022421 is about 20518.8308877480. The cubic root of 421022421 is about 749.4944272715.

Adding to 421022421 its reverse (124220124), we get a palindrome (545242545).

The spelling of 421022421 in words is "four hundred twenty-one million, twenty-two thousand, four hundred twenty-one".