21020000020993 has 8 divisors (see below), whose sum is σ = 22347760483008. Its totient is φ = 19726726843824.

The previous prime is 21020000020979. The next prime is 21020000020997. The reversal of 21020000020993 is 39902000002012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020000020993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020000020997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8621819955 + ... + 8621822392.

It is an arithmetic number, because the mean of its divisors is an integer number (2793470060376).

Almost surely, 2^{21020000020993} is an apocalyptic number.

21020000020993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21020000020993 is a deficient number, since it is larger than the sum of its proper divisors (1327760462015).

21020000020993 is a wasteful number, since it uses less digits than its factorization.

21020000020993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17243642423.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 21020000020993 in words is "twenty-one trillion, twenty billion, twenty thousand, nine hundred ninety-three".