21121021009973 has 8 divisors (see below), whose sum is σ = 21191928357600. Its totient is φ = 21050127359280.

The previous prime is 21121021009967. The next prime is 21121021009993. The reversal of 21121021009973 is 37990012012112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21121021009973 - 2⁶ = 21121021009909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121021009993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 330323 + ... + 6507776.

It is an arithmetic number, because the mean of its divisors is an integer number (2648991044700).

Almost surely, 2^{21121021009973} is an apocalyptic number.

It is an amenable number.

21121021009973 is a deficient number, since it is larger than the sum of its proper divisors (70907347627).

21121021009973 is a wasteful number, since it uses less digits than its factorization.

21121021009973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848467.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 21121021009973 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, nine thousand, nine hundred seventy-three".