21920853778006 has 4 divisors (see below), whose sum is σ = 32881280667012. Its totient is φ = 10960426889002.

The previous prime is 21920853777973. The next prime is 21920853778073. The reversal of 21920853778006 is 60087735802912.

It is a happy number.

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

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5480213444500 + ... + 5480213444503.

It is an arithmetic number, because the mean of its divisors is an integer number (8220320166753).

Almost surely, 2^{21920853778006} is an apocalyptic number.

21920853778006 is a deficient number, since it is larger than the sum of its proper divisors (10960426889006).

21920853778006 is a wasteful number, since it uses less digits than its factorization.

21920853778006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10960426889005.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 21920853778006 in words is "twenty-one trillion, nine hundred twenty billion, eight hundred fifty-three million, seven hundred seventy-eight thousand, six".