2355978421 has 4 divisors (see below), whose sum is σ = 2388252172. Its totient is φ = 2323704672.

The previous prime is 2355978413. The next prime is 2355978433. The reversal of 2355978421 is 1248795532.

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 639533521 + 1716444900 = 25289^2 + 41430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2355978421 - 2³ = 2355978413 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 (2355978461) 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, 16136766 + ... + 16136911.

It is an arithmetic number, because the mean of its divisors is an integer number (597063043).

Almost surely, 2^2355978421 is an apocalyptic number.

It is an amenable number.

2355978421 is a deficient number, since it is larger than the sum of its proper divisors (32273751).

2355978421 is an equidigital number, since it uses as much as digits as its factorization.

2355978421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32273750.

The product of its digits is 604800, while the sum is 46.

The square root of 2355978421 is about 48538.4221107362. The cubic root of 2355978421 is about 1330.6293629413.

The spelling of 2355978421 in words is "two billion, three hundred fifty-five million, nine hundred seventy-eight thousand, four hundred twenty-one".