21121110221003 has 4 divisors (see below), whose sum is σ = 22745811007248. Its totient is φ = 19496409434760.

The previous prime is 21121110220949. The next prime is 21121110221033. The reversal of 21121110221003 is 30012201112112.

It is a happy number.

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 21121110221003 - 2³² = 21116815253707 is a prime.

It is a super-2 number, since 2×21121110221003² (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 (21121110221033) 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, 812350393103 + ... + 812350393128.

It is an arithmetic number, because the mean of its divisors is an integer number (5686452751812).

Almost surely, 2^{21121110221003} is an apocalyptic number.

21121110221003 is a deficient number, since it is larger than the sum of its proper divisors (1624700786245).

21121110221003 is a wasteful number, since it uses less digits than its factorization.

21121110221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624700786244.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21121110221003 its reverse (30012201112112), we get a palindrome (51133311333115).

The spelling of 21121110221003 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty-one thousand, three".