2131421 has 4 divisors (see below), whose sum is σ = 2144352. Its totient is φ = 2118492.

The previous prime is 2131417. The next prime is 2131427. The reversal of 2131421 is 1241312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131421 - 2² = 2131417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131396 and 2131405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131427) 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, 6215 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (536088).

2^2131421 is an apocalyptic number.

It is an amenable number.

2131421 is a deficient number, since it is larger than the sum of its proper divisors (12931).

2131421 is a wasteful number, since it uses less digits than its factorization.

2131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12930.

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

The square root of 2131421 is about 1459.9386973431. The cubic root of 2131421 is about 128.6934410829.

Adding to 2131421 its reverse (1241312), we get a palindrome (3372733).

It can be divided in two parts, 2131 and 421, that added together give a palindrome (2552).

The spelling of 2131421 in words is "two million, one hundred thirty-one thousand, four hundred twenty-one".