20941213045 has 4 divisors (see below), whose sum is σ = 25129455660. Its totient is φ = 16752970432.

The previous prime is 20941213021. The next prime is 20941213091. The reversal of 20941213045 is 54031214902.

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 10846389316 + 10094823729 = 104146^2 + 100473^2 .

It is a cyclic number.

It is not a de Polignac number, because 20941213045 - 2⁷ = 20941212917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20941212998 and 20941213016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094121300 + ... + 2094121309.

It is an arithmetic number, because the mean of its divisors is an integer number (6282363915).

Almost surely, 2^20941213045 is an apocalyptic number.

It is an amenable number.

20941213045 is a deficient number, since it is larger than the sum of its proper divisors (4188242615).

20941213045 is an equidigital number, since it uses as much as digits as its factorization.

20941213045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188242614.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 20941213045 its reverse (54031214902), we get a palindrome (74972427947).

The spelling of 20941213045 in words is "twenty billion, nine hundred forty-one million, two hundred thirteen thousand, forty-five".