21011101093 has 4 divisors (see below), whose sum is σ = 21052380780. Its totient is φ = 20969821408.

The previous prime is 21011101009. The next prime is 21011101103. The reversal of 21011101093 is 39010111012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14388722209 + 6622378884 = 119953^2 + 81378^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011101093 - 2¹³ = 21011092901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011101093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20639080 + ... + 20640097.

It is an arithmetic number, because the mean of its divisors is an integer number (5263095195).

Almost surely, 2^21011101093 is an apocalyptic number.

It is an amenable number.

21011101093 is a deficient number, since it is larger than the sum of its proper divisors (41279687).

21011101093 is an equidigital number, since it uses as much as digits as its factorization.

21011101093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41279686.

The product of its (nonzero) digits is 54, while the sum is 19.

The spelling of 21011101093 in words is "twenty-one billion, eleven million, one hundred one thousand, ninety-three".