1051111021 has 2 divisors, whose sum is σ = 1051111022. Its totient is φ = 1051111020.

The previous prime is 1051111001. The next prime is 1051111031. The reversal of 1051111021 is 1201111501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965344900 + 85766121 = 31070^2 + 9261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051111021 - 2²⁹ = 514240109 is a prime.

It is a super-2 number, since 2×1051111021² = 2209668756935324882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1051110992 and 1051111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051111001) 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, 525555510 + 525555511.

It is an arithmetic number, because the mean of its divisors is an integer number (525555511).

Almost surely, 2^1051111021 is an apocalyptic number.

It is an amenable number.

1051111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051111021 is an equidigital number, since it uses as much as digits as its factorization.

1051111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 13.

The square root of 1051111021 is about 32420.8423857246. The cubic root of 1051111021 is about 1016.7547186062.

Adding to 1051111021 its reverse (1201111501), we get a palindrome (2252222522).

The spelling of 1051111021 in words is "one billion, fifty-one million, one hundred eleven thousand, twenty-one".