21611305022147 has 2 divisors, whose sum is σ = 21611305022148. Its totient is φ = 21611305022146.

The previous prime is 21611305022143. The next prime is 21611305022243. The reversal of 21611305022147 is 74122050311612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21611305022147 - 2² = 21611305022143 is a prime.

It is a super-2 number, since 2×21611305022147² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21611305022143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805652511073 + 10805652511074.

It is an arithmetic number, because the mean of its divisors is an integer number (10805652511074).

Almost surely, 2^{21611305022147} is an apocalyptic number.

21611305022147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611305022147 is an equidigital number, since it uses as much as digits as its factorization.

21611305022147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 21611305022147 its reverse (74122050311612), we get a palindrome (95733355333759).

The spelling of 21611305022147 in words is "twenty-one trillion, six hundred eleven billion, three hundred five million, twenty-two thousand, one hundred forty-seven".