21180013370 has 8 divisors (see below), whose sum is σ = 38124024084. Its totient is φ = 8472005344.

The previous prime is 21180013369. The next prime is 21180013373. The reversal of 21180013370 is 7331008112.

It can be written as a sum of positive squares in 2 ways, for example, as 20644229761 + 535783609 = 143681^2 + 23147^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21180013373) 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, 1059000659 + ... + 1059000678.

Almost surely, 2^21180013370 is an apocalyptic number.

21180013370 is a deficient number, since it is larger than the sum of its proper divisors (16944010714).

21180013370 is a wasteful number, since it uses less digits than its factorization.

21180013370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118001344.

The product of its (nonzero) digits is 1008, while the sum is 26.

The spelling of 21180013370 in words is "twenty-one billion, one hundred eighty million, thirteen thousand, three hundred seventy".