21232112402 has 8 divisors (see below), whose sum is σ = 31877964300. Its totient is φ = 10606124304.

The previous prime is 21232112401. The next prime is 21232112453. The reversal of 21232112402 is 20421123212.

It can be written as a sum of positive squares in 2 ways, for example, as 18829053961 + 2403058441 = 137219^2 + 49021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21232112401) 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, 4963277 + ... + 4967552.

Almost surely, 2^21232112402 is an apocalyptic number.

21232112402 is a deficient number, since it is larger than the sum of its proper divisors (10645851898).

21232112402 is a wasteful number, since it uses less digits than its factorization.

21232112402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9931900.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21232112402 its reverse (20421123212), we get a palindrome (41653235614).

The spelling of 21232112402 in words is "twenty-one billion, two hundred thirty-two million, one hundred twelve thousand, four hundred two".