1021129011 has 24 divisors (see below), whose sum is σ = 1748108544. Its totient is φ = 583501320.

The previous prime is 1021128967. The next prime is 1021129051. The reversal of 1021129011 is 1109211201.

It is a happy number.

It is not a de Polignac number, because 1021129011 - 2⁷ = 1021128883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021129051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298455 + ... + 301856.

It is an arithmetic number, because the mean of its divisors is an integer number (72837856).

Almost surely, 2^1021129011 is an apocalyptic number.

1021129011 is a deficient number, since it is larger than the sum of its proper divisors (726979533).

1021129011 is an frugal number, since it uses more digits than its factorization.

1021129011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600333 (or 600321 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 1021129011 is about 31955.1093097802. The cubic root of 1021129011 is about 1006.9939739566.

The spelling of 1021129011 in words is "one billion, twenty-one million, one hundred twenty-nine thousand, eleven".