20002052021 has 4 divisors (see below), whose sum is σ = 22859488032. Its totient is φ = 17144616012.

The previous prime is 20002052011. The next prime is 20002052027. The reversal of 20002052021 is 12025020002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12025020002 = 2 ⋅6012510001.

It is a cyclic number.

It is not a de Polignac number, because 20002052021 - 2¹⁴ = 20002035637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002051987 and 20002052005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002052027) 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, 1428717995 + ... + 1428718008.

It is an arithmetic number, because the mean of its divisors is an integer number (5714872008).

Almost surely, 2^20002052021 is an apocalyptic number.

It is an amenable number.

20002052021 is a deficient number, since it is larger than the sum of its proper divisors (2857436011).

20002052021 is an equidigital number, since it uses as much as digits as its factorization.

20002052021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857436010.

The product of its (nonzero) digits is 80, while the sum is 14.

Adding to 20002052021 its reverse (12025020002), we get a palindrome (32027072023).

The spelling of 20002052021 in words is "twenty billion, two million, fifty-two thousand, twenty-one".