21432113902 has 4 divisors (see below), whose sum is σ = 32148170856. Its totient is φ = 10716056950.

The previous prime is 21432113839. The next prime is 21432113909. The reversal of 21432113902 is 20931123412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432113909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358028474 + ... + 5358028477.

It is an arithmetic number, because the mean of its divisors is an integer number (8037042714).

Almost surely, 2^21432113902 is an apocalyptic number.

21432113902 is a deficient number, since it is larger than the sum of its proper divisors (10716056954).

21432113902 is a wasteful number, since it uses less digits than its factorization.

21432113902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716056953.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21432113902 in words is "twenty-one billion, four hundred thirty-two million, one hundred thirteen thousand, nine hundred two".