1021020021149 has 2 divisors, whose sum is σ = 1021020021150. Its totient is φ = 1021020021148.

The previous prime is 1021020021137. The next prime is 1021020021163. The reversal of 1021020021149 is 9411200201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944360255524 + 76659765625 = 971782^2 + 276875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020021149 - 2²⁰ = 1021018972573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021020021349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510010574 + 510510010575.

It is an arithmetic number, because the mean of its divisors is an integer number (510510010575).

Almost surely, 2^{1021020021149} is an apocalyptic number.

It is an amenable number.

1021020021149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020021149 is an equidigital number, since it uses as much as digits as its factorization.

1021020021149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1021020021149 in words is "one trillion, twenty-one billion, twenty million, twenty-one thousand, one hundred forty-nine".