20211220147 has 2 divisors, whose sum is σ = 20211220148. Its totient is φ = 20211220146.

The previous prime is 20211220063. The next prime is 20211220153. The reversal of 20211220147 is 74102211202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211220147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211220247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105610073 + 10105610074.

It is an arithmetic number, because the mean of its divisors is an integer number (10105610074).

Almost surely, 2^20211220147 is an apocalyptic number.

20211220147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211220147 is an equidigital number, since it uses as much as digits as its factorization.

20211220147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 20211220147 its reverse (74102211202), we get a palindrome (94313431349).

The spelling of 20211220147 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, one hundred forty-seven".