20111221147 has 2 divisors, whose sum is σ = 20111221148. Its totient is φ = 20111221146.

The previous prime is 20111221121. The next prime is 20111221171. The reversal of 20111221147 is 74112211102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111221147 is a prime.

It is a super-2 number, since 2×20111221147² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20111221847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055610573 + 10055610574.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610574).

Almost surely, 2^20111221147 is an apocalyptic number.

20111221147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221147 is an equidigital number, since it uses as much as digits as its factorization.

20111221147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 20111221147 its reverse (74112211102), we get a palindrome (94223432249).

The spelling of 20111221147 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, one hundred forty-seven".