21234175502 has 4 divisors (see below), whose sum is σ = 31851263256. Its totient is φ = 10617087750.

The previous prime is 21234175447. The next prime is 21234175537. The reversal of 21234175502 is 20557143212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308543874 + ... + 5308543877.

It is an arithmetic number, because the mean of its divisors is an integer number (7962815814).

Almost surely, 2^21234175502 is an apocalyptic number.

21234175502 is a deficient number, since it is larger than the sum of its proper divisors (10617087754).

21234175502 is a wasteful number, since it uses less digits than its factorization.

21234175502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617087753.

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 21234175502 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-five thousand, five hundred two".