21233435402 has 4 divisors (see below), whose sum is σ = 31850153106. Its totient is φ = 10616717700.

The previous prime is 21233435371. The next prime is 21233435407. The reversal of 21233435402 is 20453433212.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15146471041 + 6086964361 = 123071^2 + 78019^2 .

It is not an unprimeable number, because it can be changed into a prime (21233435407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308358849 + ... + 5308358852.

Almost surely, 2^21233435402 is an apocalyptic number.

21233435402 is a deficient number, since it is larger than the sum of its proper divisors (10616717704).

21233435402 is a wasteful number, since it uses less digits than its factorization.

21233435402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616717703.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21233435402 its reverse (20453433212), we get a palindrome (41686868614).

The spelling of 21233435402 in words is "twenty-one billion, two hundred thirty-three million, four hundred thirty-five thousand, four hundred two".