421220443332421 has 8 divisors (see below), whose sum is σ = 421953747836544. Its totient is φ = 420487192308480.

The previous prime is 421220443332401. The next prime is 421220443332431. The reversal of 421220443332421 is 124233344022124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421220443332421 - 2¹¹ = 421220443330373 is a prime.

It is a super-2 number, since 2×421220443332421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421220443332401) 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, 2412261 + ... + 29124901.

It is an arithmetic number, because the mean of its divisors is an integer number (52744218479568).

Almost surely, 2^{421220443332421} is an apocalyptic number.

It is an amenable number.

421220443332421 is a deficient number, since it is larger than the sum of its proper divisors (733304504123).

421220443332421 is a wasteful number, since it uses less digits than its factorization.

421220443332421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26740091.

The product of its (nonzero) digits is 221184, while the sum is 37.

Adding to 421220443332421 its reverse (124233344022124), we get a palindrome (545453787354545).

The spelling of 421220443332421 in words is "four hundred twenty-one trillion, two hundred twenty billion, four hundred forty-three million, three hundred thirty-two thousand, four hundred twenty-one".