1021124009 has 4 divisors (see below), whose sum is σ = 1026470400. Its totient is φ = 1015777620.

The previous prime is 1021123997. The next prime is 1021124029. The reversal of 1021124009 is 9004211201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9004211201 = 10739 ⋅838459.

It is a cyclic number.

It is not a de Polignac number, because 1021124009 - 2⁴ = 1021123993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021124029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2672909 + ... + 2673290.

It is an arithmetic number, because the mean of its divisors is an integer number (256617600).

Almost surely, 2^1021124009 is an apocalyptic number.

It is an amenable number.

1021124009 is a deficient number, since it is larger than the sum of its proper divisors (5346391).

1021124009 is an equidigital number, since it uses as much as digits as its factorization.

1021124009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346390.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1021124009 is about 31955.0310436401. The cubic root of 1021124009 is about 1006.9923297008.

The spelling of 1021124009 in words is "one billion, twenty-one million, one hundred twenty-four thousand, nine".