21002203434433 has 8 divisors (see below), whose sum is σ = 22617847031976. Its totient is φ = 19386572620800.

The previous prime is 21002203434427. The next prime is 21002203434461. The reversal of 21002203434433 is 33443430220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 691786437169 + 20310416997264 = 831737^2 + 4506708^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21002203434433 - 2¹³ = 21002203426241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002203434395 and 21002203434404.

It is not an unprimeable number, because it can be changed into a prime (21002203434403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362913 + ... + 6491233.

It is an arithmetic number, because the mean of its divisors is an integer number (2827230878997).

Almost surely, 2^{21002203434433} is an apocalyptic number.

It is an amenable number.

21002203434433 is a deficient number, since it is larger than the sum of its proper divisors (1615643597543).

21002203434433 is a wasteful number, since it uses less digits than its factorization.

21002203434433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391955.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 21002203434433 its reverse (33443430220012), we get a palindrome (54445633654445).

The spelling of 21002203434433 in words is "twenty-one trillion, two billion, two hundred three million, four hundred thirty-four thousand, four hundred thirty-three".