421221002131 has 4 divisors (see below), whose sum is σ = 421222309632. Its totient is φ = 421219694632.

The previous prime is 421221002129. The next prime is 421221002171. The reversal of 421221002131 is 131200122124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421221002131 - 2¹ = 421221002129 is a prime.

It is a super-2 number, since 2×421221002131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421221002099 and 421221002108.

It is not an unprimeable number, because it can be changed into a prime (421221002171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209070 + ... + 941356.

It is an arithmetic number, because the mean of its divisors is an integer number (105305577408).

Almost surely, 2^421221002131 is an apocalyptic number.

421221002131 is a deficient number, since it is larger than the sum of its proper divisors (1307501).

421221002131 is an equidigital number, since it uses as much as digits as its factorization.

421221002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307500.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 421221002131 its reverse (131200122124), we get a palindrome (552421124255).

The spelling of 421221002131 in words is "four hundred twenty-one billion, two hundred twenty-one million, two thousand, one hundred thirty-one".