20240200021 has 4 divisors (see below), whose sum is σ = 20787232492. Its totient is φ = 19693167552.

The previous prime is 20240200009. The next prime is 20240200027. The reversal of 20240200021 is 12000204202.

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 13950916996 + 6289283025 = 118114^2 + 79305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240200021 - 2¹⁵ = 20240167253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20240199974 and 20240200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20240200027) 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, 273516180 + ... + 273516253.

It is an arithmetic number, because the mean of its divisors is an integer number (5196808123).

Almost surely, 2^20240200021 is an apocalyptic number.

It is an amenable number.

20240200021 is a deficient number, since it is larger than the sum of its proper divisors (547032471).

20240200021 is an equidigital number, since it uses as much as digits as its factorization.

20240200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547032470.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20240200021 its reverse (12000204202), we get a palindrome (32240404223).

The spelling of 20240200021 in words is "twenty billion, two hundred forty million, two hundred thousand, twenty-one".