21111718373002 has 8 divisors (see below), whose sum is σ = 31670480477700. Its totient is φ = 10554891547104.

The previous prime is 21111718372993. The next prime is 21111718373023. The reversal of 21111718373002 is 20037381711112.

It is a happy number.

It is a Cunningham number, because it is equal to 4594749²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 21111718373001 + 1 = 4594749^2 + 1^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483792427 + ... + 483836062.

Almost surely, 2^{21111718373002} is an apocalyptic number.

21111718373002 is a deficient number, since it is larger than the sum of its proper divisors (10558762104698).

21111718373002 is a wasteful number, since it uses less digits than its factorization.

21111718373002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967639400.

The product of its (nonzero) digits is 14112, while the sum is 37.

The spelling of 21111718373002 in words is "twenty-one trillion, one hundred eleven billion, seven hundred eighteen million, three hundred seventy-three thousand, two".