1021231399 has 8 divisors (see below), whose sum is σ = 1079805440. Its totient is φ = 963139896.

The previous prime is 1021231373. The next prime is 1021231417. The reversal of 1021231399 is 9931321201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021231399 - 2²¹ = 1019134247 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 1021231399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021231319) 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 7 ways as a sum of consecutive naturals, for example, 116277 + ... + 124750.

It is an arithmetic number, because the mean of its divisors is an integer number (134975680).

Almost surely, 2^1021231399 is an apocalyptic number.

1021231399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1021231399 is a deficient number, since it is larger than the sum of its proper divisors (58574041).

1021231399 is a wasteful number, since it uses less digits than its factorization.

1021231399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241269.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 1021231399 is about 31956.7113295470. The cubic root of 1021231399 is about 1007.0276297279.

The spelling of 1021231399 in words is "one billion, twenty-one million, two hundred thirty-one thousand, three hundred ninety-nine".