1020322421 has 4 divisors (see below), whose sum is σ = 1022555532. Its totient is φ = 1018089312.

The previous prime is 1020322319. The next prime is 1020322441. The reversal of 1020322421 is 1242230201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242230201 = 10771 ⋅115331.

It can be written as a sum of positive squares in 2 ways, for example, as 465955396 + 554367025 = 21586^2 + 23545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020322421 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 1020322421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020322441) 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, 1115870 + ... + 1116783.

It is an arithmetic number, because the mean of its divisors is an integer number (255638883).

Almost surely, 2^1020322421 is an apocalyptic number.

It is an amenable number.

1020322421 is a deficient number, since it is larger than the sum of its proper divisors (2233111).

1020322421 is an equidigital number, since it uses as much as digits as its factorization.

1020322421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233110.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1020322421 is about 31942.4861430666. The cubic root of 1020322421 is about 1006.7287625370.

Adding to 1020322421 its reverse (1242230201), we get a palindrome (2262552622).

The spelling of 1020322421 in words is "one billion, twenty million, three hundred twenty-two thousand, four hundred twenty-one".