1021343420 has 12 divisors (see below), whose sum is σ = 2144821224. Its totient is φ = 408537360.

The previous prime is 1021343413. The next prime is 1021343447. The reversal of 1021343420 is 243431201.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 51067171 = 1021343420 / (1 + 0 + 2 + 1 + 3 + 4 + 3 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1021343392 and 1021343401.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25533566 + ... + 25533605.

It is an arithmetic number, because the mean of its divisors is an integer number (178735102).

Almost surely, 2^1021343420 is an apocalyptic number.

1021343420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021343420 is an abundant number, since it is smaller than the sum of its proper divisors (1123477804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021343420 is a wasteful number, since it uses less digits than its factorization.

1021343420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51067180 (or 51067178 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1021343420 is about 31958.4639806108. The cubic root of 1021343420 is about 1007.0644493679.

Adding to 1021343420 its reverse (243431201), we get a palindrome (1264774621).

The spelling of 1021343420 in words is "one billion, twenty-one million, three hundred forty-three thousand, four hundred twenty".