21030234433 has 6 divisors (see below), whose sum is σ = 22772384214. Its totient is φ = 19412523936.

The previous prime is 21030234377. The next prime is 21030234451. The reversal of 21030234433 is 33443203012.

It can be written as a sum of positive squares in 3 ways, for example, as 2893686849 + 18136547584 = 53793^2 + 134672^2 .

It is not a de Polignac number, because 21030234433 - 2²⁹ = 20493363521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030234398 and 21030234407.

It is not an unprimeable number, because it can be changed into a prime (21030234473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62219460 + ... + 62219797.

It is an arithmetic number, because the mean of its divisors is an integer number (3795397369).

Almost surely, 2^21030234433 is an apocalyptic number.

It is an amenable number.

21030234433 is a deficient number, since it is larger than the sum of its proper divisors (1742149781).

21030234433 is a wasteful number, since it uses less digits than its factorization.

21030234433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124439283 (or 124439270 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21030234433 its reverse (33443203012), we get a palindrome (54473437445).

The spelling of 21030234433 in words is "twenty-one billion, thirty million, two hundred thirty-four thousand, four hundred thirty-three".