21112211121031 has 2 divisors, whose sum is σ = 21112211121032. Its totient is φ = 21112211121030.

The previous prime is 21112211120929. The next prime is 21112211121041. The reversal of 21112211121031 is 13012111221112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112211121031 - 2¹¹ = 21112211118983 is a prime.

It is a super-2 number, since 2×21112211121031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112211121041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105560515 + 10556105560516.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105560516).

Almost surely, 2^{21112211121031} is an apocalyptic number.

21112211121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112211121031 is an equidigital number, since it uses as much as digits as its factorization.

21112211121031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 21112211121031 its reverse (13012111221112), we get a palindrome (34124322342143).

The spelling of 21112211121031 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, thirty-one".