21011001122203 has 4 divisors (see below), whose sum is σ = 21011021811648. Its totient is φ = 21010980432760.

The previous prime is 21011001122173. The next prime is 21011001122207. The reversal of 21011001122203 is 30222110011012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011001122203 - 2¹⁷ = 21011000991131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011001122207) 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, 8738251 + ... + 10880212.

It is an arithmetic number, because the mean of its divisors is an integer number (5252755452912).

Almost surely, 2^{21011001122203} is an apocalyptic number.

21011001122203 is a deficient number, since it is larger than the sum of its proper divisors (20689445).

21011001122203 is a wasteful number, since it uses less digits than its factorization.

21011001122203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20689444.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21011001122203 its reverse (30222110011012), we get a palindrome (51233111133215).

The spelling of 21011001122203 in words is "twenty-one trillion, eleven billion, one million, one hundred twenty-two thousand, two hundred three".