1002340021 has 4 divisors (see below), whose sum is σ = 1036903500. Its totient is φ = 967776544.

The previous prime is 1002339979. The next prime is 1002340037. The reversal of 1002340021 is 1200432001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200432001 = 181 ⋅6632221.

It can be written as a sum of positive squares in 2 ways, for example, as 781817521 + 220522500 = 27961^2 + 14850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002340021 - 2⁷ = 1002339893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002339983 and 1002340010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002340051) 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, 17281696 + ... + 17281753.

It is an arithmetic number, because the mean of its divisors is an integer number (259225875).

Almost surely, 2^1002340021 is an apocalyptic number.

It is an amenable number.

1002340021 is a deficient number, since it is larger than the sum of its proper divisors (34563479).

1002340021 is an equidigital number, since it uses as much as digits as its factorization.

1002340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34563478.

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

The square root of 1002340021 is about 31659.7539630364. The cubic root of 1002340021 is about 1000.7793993788.

Adding to 1002340021 its reverse (1200432001), we get a palindrome (2202772022).

The spelling of 1002340021 in words is "one billion, two million, three hundred forty thousand, twenty-one".