1021139369 has 4 divisors (see below), whose sum is σ = 1027254144. Its totient is φ = 1015024596.

The previous prime is 1021139341. The next prime is 1021139381. The reversal of 1021139369 is 9639311201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1021139369 - 2⁸ = 1021139113 is a prime.

It is a super-2 number, since 2×1021139369² = 2085451221843436322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021139269) 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, 3057137 + ... + 3057470.

It is an arithmetic number, because the mean of its divisors is an integer number (256813536).

Almost surely, 2^1021139369 is an apocalyptic number.

It is an amenable number.

1021139369 is a deficient number, since it is larger than the sum of its proper divisors (6114775).

1021139369 is an equidigital number, since it uses as much as digits as its factorization.

1021139369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6114774.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1021139369 is about 31955.2713804781. The cubic root of 1021139369 is about 1006.9973788181.

The spelling of 1021139369 in words is "one billion, twenty-one million, one hundred thirty-nine thousand, three hundred sixty-nine".