20421340202 has 8 divisors (see below), whose sum is σ = 32433893316. Its totient is φ = 9610042432.

The previous prime is 20421340189. The next prime is 20421340207. The reversal of 20421340202 is 20204312402.

It can be written as a sum of positive squares in 2 ways, for example, as 19246290361 + 1175049841 = 138731^2 + 34279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20421340202² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20421340207) 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, 300313793 + ... + 300313860.

Almost surely, 2^20421340202 is an apocalyptic number.

20421340202 is a deficient number, since it is larger than the sum of its proper divisors (12012553114).

20421340202 is a wasteful number, since it uses less digits than its factorization.

20421340202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600627672.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20421340202 its reverse (20204312402), we get a palindrome (40625652604).

The spelling of 20421340202 in words is "twenty billion, four hundred twenty-one million, three hundred forty thousand, two hundred two".