1020320421 has 8 divisors (see below), whose sum is σ = 1380732384. Its totient is φ = 670061040.

The previous prime is 1020320419. The next prime is 1020320423. The reversal of 1020320421 is 1240230201.

It is an interprime number because it is at equal distance from previous prime (1020320419) and next prime (1020320423).

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

It is not a de Polignac number, because 1020320421 - 2¹ = 1020320419 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020320421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020320423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2537910 + ... + 2538311.

It is an arithmetic number, because the mean of its divisors is an integer number (172591548).

Almost surely, 2^1020320421 is an apocalyptic number.

It is an amenable number.

1020320421 is a deficient number, since it is larger than the sum of its proper divisors (360411963).

1020320421 is an equidigital number, since it uses as much as digits as its factorization.

1020320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076291.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1020320421 is about 31942.4548367842. The cubic root of 1020320421 is about 1006.7281047519.

Adding to 1020320421 its reverse (1240230201), we get a palindrome (2260550622).

The spelling of 1020320421 in words is "one billion, twenty million, three hundred twenty thousand, four hundred twenty-one".