1021141399 has 4 divisors (see below), whose sum is σ = 1028487880. Its totient is φ = 1013794920.

The previous prime is 1021141391. The next prime is 1021141409. The reversal of 1021141399 is 9931411201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021141399 - 2³ = 1021141391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021141399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021141391) 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, 3673032 + ... + 3673309.

It is an arithmetic number, because the mean of its divisors is an integer number (257121970).

Almost surely, 2^1021141399 is an apocalyptic number.

1021141399 is a deficient number, since it is larger than the sum of its proper divisors (7346481).

1021141399 is an equidigital number, since it uses as much as digits as its factorization.

1021141399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7346480.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1021141399 is about 31955.3031436098. The cubic root of 1021141399 is about 1006.9980461130.

The spelling of 1021141399 in words is "one billion, twenty-one million, one hundred forty-one thousand, three hundred ninety-nine".