21173878202 has 8 divisors (see below), whose sum is σ = 31920420000. Its totient is φ = 10533738204.

The previous prime is 21173878181. The next prime is 21173878241. The reversal of 21173878202 is 20287837112.

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

It is a super-2 number, since 2×21173878202² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21173878202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26599952 + ... + 26600747.

It is an arithmetic number, because the mean of its divisors is an integer number (3990052500).

Almost surely, 2^21173878202 is an apocalyptic number.

21173878202 is a deficient number, since it is larger than the sum of its proper divisors (10746541798).

21173878202 is a wasteful number, since it uses less digits than its factorization.

21173878202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53200900.

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 21173878202 in words is "twenty-one billion, one hundred seventy-three million, eight hundred seventy-eight thousand, two hundred two".