424221320421 has 24 divisors (see below), whose sum is σ = 627052191480. Its totient is φ = 276266330496.

The previous prime is 424221320407. The next prime is 424221320473. The reversal of 424221320421 is 124023122424.

It is a happy number.

424221320421 is a `hidden beast` number, since 4 + 2 + 4 + 2 + 213 + 20 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 300946599396 + 123274721025 = 548586^2 + 351105^2 .

It is not a de Polignac number, because 424221320421 - 2⁶ = 424221320357 is a prime.

It is a super-3 number, since 3×424221320421³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424221320921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1832586 + ... + 2051051.

It is an arithmetic number, because the mean of its divisors is an integer number (26127174645).

Almost surely, 2^424221320421 is an apocalyptic number.

It is an amenable number.

424221320421 is a deficient number, since it is larger than the sum of its proper divisors (202830871059).

424221320421 is a wasteful number, since it uses less digits than its factorization.

424221320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883925 (or 3883922 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 424221320421 its reverse (124023122424), we get a palindrome (548244442845).

The spelling of 424221320421 in words is "four hundred twenty-four billion, two hundred twenty-one million, three hundred twenty thousand, four hundred twenty-one".