20421534435204 has 48 divisors (see below), whose sum is σ = 54547140988928. Its totient is φ = 5825111714208.

The previous prime is 20421534435193. The next prime is 20421534435209. The reversal of 20421534435204 is 40253443512402.

It is not an unprimeable number, because it can be changed into a prime (20421534435209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200207254 + ... + 200309229.

Almost surely, 2^{20421534435204} is an apocalyptic number.

It is an amenable number.

20421534435204 is an abundant number, since it is smaller than the sum of its proper divisors (34125606553724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421534435204 is a wasteful number, since it uses less digits than its factorization.

20421534435204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400517104 (or 400517102 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 39.

Adding to 20421534435204 its reverse (40253443512402), we get a palindrome (60674977947606).

The spelling of 20421534435204 in words is "twenty trillion, four hundred twenty-one billion, five hundred thirty-four million, four hundred thirty-five thousand, two hundred four".