21011122120003 has 4 divisors (see below), whose sum is σ = 21011140159920. Its totient is φ = 21011104080088.

The previous prime is 21011122119973. The next prime is 21011122120007. The reversal of 21011122120003 is 30002122111012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011122120003 is a prime.

It is a super-2 number, since 2×21011122120003² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011122120007) 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, 7142668 + ... + 9645721.

It is an arithmetic number, because the mean of its divisors is an integer number (5252785039980).

Almost surely, 2^{21011122120003} is an apocalyptic number.

21011122120003 is a deficient number, since it is larger than the sum of its proper divisors (18039917).

21011122120003 is a wasteful number, since it uses less digits than its factorization.

21011122120003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18039916.

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

Adding to 21011122120003 its reverse (30002122111012), we get a palindrome (51013244231015).

The spelling of 21011122120003 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty thousand, three".