21432241402 has 24 divisors (see below), whose sum is σ = 38054837268. Its totient is φ = 8992547520.

The previous prime is 21432241387. The next prime is 21432241427. The reversal of 21432241402 is 20414223412.

It can be written as a sum of positive squares in 2 ways, for example, as 19237412601 + 2194828801 = 138699^2 + 46849^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3403123 + ... + 3409414.

Almost surely, 2^21432241402 is an apocalyptic number.

21432241402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21432241402 is a deficient number, since it is larger than the sum of its proper divisors (16622595866).

21432241402 is a wasteful number, since it uses less digits than its factorization.

21432241402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812574 (or 6812563 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21432241402 its reverse (20414223412), we get a palindrome (41846464814).

The spelling of 21432241402 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-one thousand, four hundred two".