21011020010993 has 16 divisors (see below), whose sum is σ = 21240965961600. Its totient is φ = 20781763107840.

The previous prime is 21011020010957. The next prime is 21011020011049. The reversal of 21011020010993 is 39901002011012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011020010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011020010593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390287588 + ... + 390341418.

It is an arithmetic number, because the mean of its divisors is an integer number (1327560372600).

Almost surely, 2^{21011020010993} is an apocalyptic number.

It is an amenable number.

21011020010993 is a deficient number, since it is larger than the sum of its proper divisors (229945950607).

21011020010993 is a wasteful number, since it uses less digits than its factorization.

21011020010993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60152.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 21011020010993 in words is "twenty-one trillion, eleven billion, twenty million, ten thousand, nine hundred ninety-three".