1021421203424 has 24 divisors (see below), whose sum is σ = 2020453448328. Its totient is φ = 508290168960.

The previous prime is 1021421203421. The next prime is 1021421203441. The reversal of 1021421203424 is 4243021241201.

It is a junction number, because it is equal to n+sod(n) for n = 1021421203393 and 1021421203402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021421203421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75631667 + ... + 75645170.

It is an arithmetic number, because the mean of its divisors is an integer number (84185560347).

Almost surely, 2^{1021421203424} is an apocalyptic number.

It is an amenable number.

1021421203424 is a deficient number, since it is larger than the sum of its proper divisors (999032244904).

1021421203424 is a wasteful number, since it uses less digits than its factorization.

1021421203424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151277058 (or 151277050 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 1021421203424 its reverse (4243021241201), we get a palindrome (5264442444625).

The spelling of 1021421203424 in words is "one trillion, twenty-one billion, four hundred twenty-one million, two hundred three thousand, four hundred twenty-four".