20641021147 has 2 divisors, whose sum is σ = 20641021148. Its totient is φ = 20641021146.

The previous prime is 20641021133. The next prime is 20641021213. The reversal of 20641021147 is 74112014602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20641021147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20641021117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320510573 + 10320510574.

It is an arithmetic number, because the mean of its divisors is an integer number (10320510574).

Almost surely, 2^20641021147 is an apocalyptic number.

20641021147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641021147 is an equidigital number, since it uses as much as digits as its factorization.

20641021147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 20641021147 its reverse (74112014602), we get a palindrome (94753035749).

The spelling of 20641021147 in words is "twenty billion, six hundred forty-one million, twenty-one thousand, one hundred forty-seven".