202131421 has 4 divisors (see below), whose sum is σ = 209101500. Its totient is φ = 195161344.

The previous prime is 202131403. The next prime is 202131487. The reversal of 202131421 is 124131202.

202131421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84842521 + 117288900 = 9211^2 + 10830^2 .

It is a cyclic number.

It is not a de Polignac number, because 202131421 - 2⁵ = 202131389 is a prime.

It is a super-2 number, since 2×202131421² = 81714222710958482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202131395 and 202131404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202131121) 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, 3484996 + ... + 3485053.

It is an arithmetic number, because the mean of its divisors is an integer number (52275375).

Almost surely, 2^202131421 is an apocalyptic number.

It is an amenable number.

202131421 is a deficient number, since it is larger than the sum of its proper divisors (6970079).

202131421 is an equidigital number, since it uses as much as digits as its factorization.

202131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6970078.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 202131421 is about 14217.2930264520. The cubic root of 202131421 is about 586.8736488079.

Adding to 202131421 its reverse (124131202), we get a palindrome (326262623).

The spelling of 202131421 in words is "two hundred two million, one hundred thirty-one thousand, four hundred twenty-one".