421443441020421 has 24 divisors (see below), whose sum is σ = 612240466032000. Its totient is φ = 279352516434432.

The previous prime is 421443441020297. The next prime is 421443441020431. The reversal of 421443441020421 is 124020144344124.

421443441020421 is a `hidden beast` number, since 4 + 2 + 1 + 4 + 4 + 3 + 441 + 0 + 204 + 2 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-421443441020421 is a prime.

It is a super-2 number, since 2×421443441020421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421443441020431) 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, 7585116 + ... + 30007013.

It is an arithmetic number, because the mean of its divisors is an integer number (25510019418000).

Almost surely, 2^{421443441020421} is an apocalyptic number.

It is an amenable number.

421443441020421 is a deficient number, since it is larger than the sum of its proper divisors (190797025011579).

421443441020421 is a wasteful number, since it uses less digits than its factorization.

421443441020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37599273 (or 37599270 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 36.

Adding to 421443441020421 its reverse (124020144344124), we get a palindrome (545463585364545).

The spelling of 421443441020421 in words is "four hundred twenty-one trillion, four hundred forty-three billion, four hundred forty-one million, twenty thousand, four hundred twenty-one".