1032400021 has 4 divisors (see below), whose sum is σ = 1093129452. Its totient is φ = 971670592.

The previous prime is 1032400009. The next prime is 1032400027. The reversal of 1032400021 is 1200042301.

1032400021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 772061796 + 260338225 = 27786^2 + 16135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1032400021 - 2¹¹ = 1032397973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1032399974 and 1032400010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1032400027) 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, 30364690 + ... + 30364723.

It is an arithmetic number, because the mean of its divisors is an integer number (273282363).

Almost surely, 2^1032400021 is an apocalyptic number.

It is an amenable number.

1032400021 is a deficient number, since it is larger than the sum of its proper divisors (60729431).

1032400021 is an equidigital number, since it uses as much as digits as its factorization.

1032400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60729430.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1032400021 is about 32130.9822601177. The cubic root of 1032400021 is about 1010.6854220742.

Adding to 1032400021 its reverse (1200042301), we get a palindrome (2232442322).

The spelling of 1032400021 in words is "one billion, thirty-two million, four hundred thousand, twenty-one".