1125136021 has 2 divisors, whose sum is σ = 1125136022. Its totient is φ = 1125136020.

The previous prime is 1125136003. The next prime is 1125136039. The reversal of 1125136021 is 1206315211.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1125136003) and next prime (1125136039).

It can be written as a sum of positive squares in only one way, i.e., 896703025 + 228432996 = 29945^2 + 15114^2 .

It is an emirp because it is prime and its reverse (1206315211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1125136021 - 2⁵ = 1125135989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1125135983 and 1125136001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125136081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562568010 + 562568011.

It is an arithmetic number, because the mean of its divisors is an integer number (562568011).

Almost surely, 2^1125136021 is an apocalyptic number.

It is an amenable number.

1125136021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125136021 is an equidigital number, since it uses as much as digits as its factorization.

1125136021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1125136021 is about 33543.0472825592. The cubic root of 1125136021 is about 1040.0838261451.

The spelling of 1125136021 in words is "one billion, one hundred twenty-five million, one hundred thirty-six thousand, twenty-one".