20421003443433 has 16 divisors (see below), whose sum is σ = 27676689370176. Its totient is φ = 13389697391040.

The previous prime is 20421003443411. The next prime is 20421003443437. The reversal of 20421003443433 is 33434430012402.

It is a happy number.

It is not a de Polignac number, because 20421003443433 - 2⁶ = 20421003443369 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20421003443394 and 20421003443403.

It is not an unprimeable number, because it can be changed into a prime (20421003443437) 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, 2497710 + ... + 6861527.

It is an arithmetic number, because the mean of its divisors is an integer number (1729793085636).

Almost surely, 2^{20421003443433} is an apocalyptic number.

It is an amenable number.

20421003443433 is a deficient number, since it is larger than the sum of its proper divisors (7255685926743).

20421003443433 is a wasteful number, since it uses less digits than its factorization.

20421003443433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9371224.

The product of its (nonzero) digits is 82944, while the sum is 33.

Adding to 20421003443433 its reverse (33434430012402), we get a palindrome (53855433455835).

The spelling of 20421003443433 in words is "twenty trillion, four hundred twenty-one billion, three million, four hundred forty-three thousand, four hundred thirty-three".