21003022111 has 4 divisors (see below), whose sum is σ = 21010259952. Its totient is φ = 20995784272.

The previous prime is 21003022069. The next prime is 21003022121. The reversal of 21003022111 is 11122030012.

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 21003022111 - 2¹¹ = 21003020063 is a prime.

It is a super-2 number, since 2×21003022111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003022091 and 21003022100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003022121) 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, 3614566 + ... + 3620371.

It is an arithmetic number, because the mean of its divisors is an integer number (5252564988).

Almost surely, 2^21003022111 is an apocalyptic number.

21003022111 is a deficient number, since it is larger than the sum of its proper divisors (7237841).

21003022111 is an equidigital number, since it uses as much as digits as its factorization.

21003022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7237840.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21003022111 its reverse (11122030012), we get a palindrome (32125052123).

The spelling of 21003022111 in words is "twenty-one billion, three million, twenty-two thousand, one hundred eleven".