421435122021 has 40 divisors (see below), whose sum is σ = 647524293240. Its totient is φ = 272958221952.

The previous prime is 421435121977. The next prime is 421435122029. The reversal of 421435122021 is 120221534124.

421435122021 is a `hidden beast` number, since 4 + 2 + 1 + 435 + 1 + 220 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 381349476225 + 40085645796 = 617535^2 + 200214^2 .

It is not a de Polignac number, because 421435122021 - 2³³ = 412845187429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421435122029) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1925115 + ... + 2132823.

It is an arithmetic number, because the mean of its divisors is an integer number (16188107331).

Almost surely, 2^421435122021 is an apocalyptic number.

It is an amenable number.

421435122021 is a deficient number, since it is larger than the sum of its proper divisors (226089171219).

421435122021 is a wasteful number, since it uses less digits than its factorization.

421435122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208435 (or 208426 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 421435122021 its reverse (120221534124), we get a palindrome (541656656145).

The spelling of 421435122021 in words is "four hundred twenty-one billion, four hundred thirty-five million, one hundred twenty-two thousand, twenty-one".