2745214921 has 4 divisors (see below), whose sum is σ = 2745850500. Its totient is φ = 2744579344.

The previous prime is 2745214877. The next prime is 2745214931. The reversal of 2745214921 is 1294125472.

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 229189321 + 2516025600 = 15139^2 + 50160^2 .

It is a cyclic number.

It is not a de Polignac number, because 2745214921 - 2⁷ = 2745214793 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2745214931) 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, 311266 + ... + 319963.

It is an arithmetic number, because the mean of its divisors is an integer number (686462625).

Almost surely, 2^2745214921 is an apocalyptic number.

It is an amenable number.

2745214921 is a deficient number, since it is larger than the sum of its proper divisors (635579).

2745214921 is an equidigital number, since it uses as much as digits as its factorization.

2745214921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635578.

The product of its digits is 40320, while the sum is 37.

The square root of 2745214921 is about 52394.7986063502. The cubic root of 2745214921 is about 1400.2065887313.

The spelling of 2745214921 in words is "two billion, seven hundred forty-five million, two hundred fourteen thousand, nine hundred twenty-one".