421002131 has 4 divisors (see below), whose sum is σ = 459275064. Its totient is φ = 382729200.

The previous prime is 421002119. The next prime is 421002149. The reversal of 421002131 is 131200124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421002131 - 2⁶ = 421002067 is a prime.

It is a super-2 number, since 2×421002131² = 354485588613082322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421002731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19136450 + ... + 19136471.

It is an arithmetic number, because the mean of its divisors is an integer number (114818766).

Almost surely, 2^421002131 is an apocalyptic number.

421002131 is a deficient number, since it is larger than the sum of its proper divisors (38272933).

421002131 is a wasteful number, since it uses less digits than its factorization.

421002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38272932.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 421002131 is about 20518.3364579100. The cubic root of 421002131 is about 749.4823871477.

Adding to 421002131 its reverse (131200124), we get a palindrome (552202255).

The spelling of 421002131 in words is "four hundred twenty-one million, two thousand, one hundred thirty-one".