1021125101 has 2 divisors, whose sum is σ = 1021125102. Its totient is φ = 1021125100.

The previous prime is 1021125097. The next prime is 1021125121. The reversal of 1021125101 is 1015211201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 960690025 + 60435076 = 30995^2 + 7774^2 .

It is an emirp because it is prime and its reverse (1015211201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021125101 - 2² = 1021125097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021125121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510562550 + 510562551.

It is an arithmetic number, because the mean of its divisors is an integer number (510562551).

Almost surely, 2^1021125101 is an apocalyptic number.

It is an amenable number.

1021125101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021125101 is an equidigital number, since it uses as much as digits as its factorization.

1021125101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1021125101 is about 31955.0481301468. The cubic root of 1021125101 is about 1006.9926886631.

Adding to 1021125101 its reverse (1015211201), we get a palindrome (2036336302).

The spelling of 1021125101 in words is "one billion, twenty-one million, one hundred twenty-five thousand, one hundred one".