21432212402 has 4 divisors (see below), whose sum is σ = 32148318606. Its totient is φ = 10716106200.

The previous prime is 21432212377. The next prime is 21432212407. The reversal of 21432212402 is 20421223412.

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., 20999197921 + 433014481 = 144911^2 + 20809^2 .

It is not an unprimeable number, because it can be changed into a prime (21432212407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358053099 + ... + 5358053102.

Almost surely, 2^21432212402 is an apocalyptic number.

21432212402 is a deficient number, since it is larger than the sum of its proper divisors (10716106204).

21432212402 is a wasteful number, since it uses less digits than its factorization.

21432212402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716106203.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21432212402 its reverse (20421223412), we get a palindrome (41853435814).

The spelling of 21432212402 in words is "twenty-one billion, four hundred thirty-two million, two hundred twelve thousand, four hundred two".