421121130021 has 24 divisors (see below), whose sum is σ = 623806195584. Its totient is φ = 273633863040.

The previous prime is 421121130007. The next prime is 421121130029. The reversal of 421121130021 is 120031121124.

421121130021 is a `hidden beast` number, since 421 + 1 + 211 + 30 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 421121130021 - 2²⁷ = 420986912293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421121129976 and 421121130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421121130029) 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, 1963531 + ... + 2167416.

It is an arithmetic number, because the mean of its divisors is an integer number (25991924816).

Almost surely, 2^421121130021 is an apocalyptic number.

It is an amenable number.

421121130021 is a deficient number, since it is larger than the sum of its proper divisors (202685065563).

421121130021 is a wasteful number, since it uses less digits than its factorization.

421121130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131241 (or 4131238 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 421121130021 its reverse (120031121124), we get a palindrome (541152251145).

The spelling of 421121130021 in words is "four hundred twenty-one billion, one hundred twenty-one million, one hundred thirty thousand, twenty-one".