2781213421 has 8 divisors (see below), whose sum is σ = 3214244160. Its totient is φ = 2357111328.

The previous prime is 2781213403. The next prime is 2781213427. The reversal of 2781213421 is 1243121872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2781213421 - 2²¹ = 2779116269 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 (2781213427) 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 7 ways as a sum of consecutive naturals, for example, 2231491 + ... + 2232736.

It is an arithmetic number, because the mean of its divisors is an integer number (401780520).

Almost surely, 2^2781213421 is an apocalyptic number.

It is an amenable number.

2781213421 is a deficient number, since it is larger than the sum of its proper divisors (433030739).

2781213421 is an equidigital number, since it uses as much as digits as its factorization.

2781213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464323.

The product of its digits is 5376, while the sum is 31.

The square root of 2781213421 is about 52737.2109710022. The cubic root of 2781213421 is about 1406.3004168104.

The spelling of 2781213421 in words is "two billion, seven hundred eighty-one million, two hundred thirteen thousand, four hundred twenty-one".