21533423213402 has 4 divisors (see below), whose sum is σ = 32300134820106. Its totient is φ = 10766711606700.

The previous prime is 21533423213387. The next prime is 21533423213429. The reversal of 21533423213402 is 20431232433512.

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., 15452124184561 + 6081299028841 = 3930919^2 + 2466029^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5383355803349 + ... + 5383355803352.

Almost surely, 2^{21533423213402} is an apocalyptic number.

21533423213402 is a deficient number, since it is larger than the sum of its proper divisors (10766711606704).

21533423213402 is a wasteful number, since it uses less digits than its factorization.

21533423213402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766711606703.

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 21533423213402 its reverse (20431232433512), we get a palindrome (41964655646914).

The spelling of 21533423213402 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred twenty-three million, two hundred thirteen thousand, four hundred two".