111211001011021 has 2 divisors, whose sum is σ = 111211001011022. Its totient is φ = 111211001011020.

The previous prime is 111211001010997. The next prime is 111211001011049. The reversal of 111211001011021 is 120110100112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110771120345796 + 439880665225 = 10524786^2 + 663235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111211001011021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211001010992 and 111211001011010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211001011081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605500505510 + 55605500505511.

It is an arithmetic number, because the mean of its divisors is an integer number (55605500505511).

Almost surely, 2^{111211001011021} is an apocalyptic number.

It is an amenable number.

111211001011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211001011021 is an equidigital number, since it uses as much as digits as its factorization.

111211001011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111211001011021 its reverse (120110100112111), we get a palindrome (231321101123132).

The spelling of 111211001011021 in words is "one hundred eleven trillion, two hundred eleven billion, one million, eleven thousand, twenty-one".