21230010433 has 4 divisors (see below), whose sum is σ = 21250563268. Its totient is φ = 21209457600.

The previous prime is 21230010419. The next prime is 21230010467. The reversal of 21230010433 is 33401003212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20727936784 + 502073649 = 143972^2 + 22407^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230010433 - 2²¹ = 21227913281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21230010433.

It is not an unprimeable number, because it can be changed into a prime (21230010493) 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, 10274868 + ... + 10276933.

It is an arithmetic number, because the mean of its divisors is an integer number (5312640817).

Almost surely, 2^21230010433 is an apocalyptic number.

It is an amenable number.

21230010433 is a deficient number, since it is larger than the sum of its proper divisors (20552835).

21230010433 is a wasteful number, since it uses less digits than its factorization.

21230010433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20552834.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21230010433 its reverse (33401003212), we get a palindrome (54631013645).

The spelling of 21230010433 in words is "twenty-one billion, two hundred thirty million, ten thousand, four hundred thirty-three".