21121444003 has 8 divisors (see below), whose sum is σ = 23064698160. Its totient is φ = 19182043680.

The previous prime is 21121443949. The next prime is 21121444009. The reversal of 21121444003 is 30044412112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121444003 is a prime.

It is a super-2 number, since 2×21121444003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121444009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951988 + ... + 973921.

It is an arithmetic number, because the mean of its divisors is an integer number (2883087270).

Almost surely, 2^21121444003 is an apocalyptic number.

21121444003 is a deficient number, since it is larger than the sum of its proper divisors (1943254157).

21121444003 is a wasteful number, since it uses less digits than its factorization.

21121444003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926917.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21121444003 its reverse (30044412112), we get a palindrome (51165856115).

It can be divided in two parts, 21121 and 444003, that added together give a square (465124 = 682²).

The spelling of 21121444003 in words is "twenty-one billion, one hundred twenty-one million, four hundred forty-four thousand, three".