71111232121 has 2 divisors, whose sum is σ = 71111232122. Its totient is φ = 71111232120.

The previous prime is 71111232053. The next prime is 71111232131. The reversal of 71111232121 is 12123211117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64546991721 + 6564240400 = 254061^2 + 81020^2 .

It is a cyclic number.

It is not a de Polignac number, because 71111232121 - 2¹³ = 71111223929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71111232092 and 71111232101.

It is not a weakly prime, because it can be changed into another prime (71111232131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35555616060 + 35555616061.

It is an arithmetic number, because the mean of its divisors is an integer number (35555616061).

Almost surely, 2^71111232121 is an apocalyptic number.

It is an amenable number.

71111232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

71111232121 is an equidigital number, since it uses as much as digits as its factorization.

71111232121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 22.

Adding to 71111232121 its reverse (12123211117), we get a palindrome (83234443238).

The spelling of 71111232121 in words is "seventy-one billion, one hundred eleven million, two hundred thirty-two thousand, one hundred twenty-one".