2215431421 has 4 divisors (see below), whose sum is σ = 2531921632. Its totient is φ = 1898941212.

The previous prime is 2215431401. The next prime is 2215431437. The reversal of 2215431421 is 1241345122.

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 not a de Polignac number, because 2215431421 - 2¹³ = 2215423229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215431401) 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, 158245095 + ... + 158245108.

It is an arithmetic number, because the mean of its divisors is an integer number (632980408).

Almost surely, 2^2215431421 is an apocalyptic number.

It is an amenable number.

2215431421 is a deficient number, since it is larger than the sum of its proper divisors (316490211).

2215431421 is an equidigital number, since it uses as much as digits as its factorization.

2215431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316490210.

The product of its digits is 1920, while the sum is 25.

The square root of 2215431421 is about 47068.3696445925. The cubic root of 2215431421 is about 1303.6252696827.

Adding to 2215431421 its reverse (1241345122), we get a palindrome (3456776543).

The spelling of 2215431421 in words is "two billion, two hundred fifteen million, four hundred thirty-one thousand, four hundred twenty-one".