20410002430021 has 4 divisors (see below), whose sum is σ = 20410011568332. Its totient is φ = 20409993291712.

The previous prime is 20410002429983. The next prime is 20410002430039. The reversal of 20410002430021 is 12003420001402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6517609867521 + 13892392562500 = 2552961^2 + 3727250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20410002430021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20410002430421) 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, 1259325 + ... + 6511981.

It is an arithmetic number, because the mean of its divisors is an integer number (5102502892083).

Almost surely, 2^{20410002430021} is an apocalyptic number.

It is an amenable number.

20410002430021 is a deficient number, since it is larger than the sum of its proper divisors (9138311).

20410002430021 is an equidigital number, since it uses as much as digits as its factorization.

20410002430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138310.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20410002430021 its reverse (12003420001402), we get a palindrome (32413422431423).

The spelling of 20410002430021 in words is "twenty trillion, four hundred ten billion, two million, four hundred thirty thousand, twenty-one".