21012653186 has 8 divisors (see below), whose sum is σ = 36021691200. Its totient is φ = 9005422788.

The previous prime is 21012653183. The next prime is 21012653201. The reversal of 21012653186 is 68135621012.

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 (21012653183) 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, 750451886 + ... + 750451913.

It is an arithmetic number, because the mean of its divisors is an integer number (4502711400).

Almost surely, 2^21012653186 is an apocalyptic number.

21012653186 is a deficient number, since it is larger than the sum of its proper divisors (15009038014).

21012653186 is a wasteful number, since it uses less digits than its factorization.

21012653186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500903808.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21012653186 in words is "twenty-one billion, twelve million, six hundred fifty-three thousand, one hundred eighty-six".