21003105202444 has 24 divisors (see below), whose sum is σ = 36892493003520. Its totient is φ = 10462447958544.

The previous prime is 21003105202441. The next prime is 21003105202447. The reversal of 21003105202444 is 44420250130012.

It is an interprime number because it is at equal distance from previous prime (21003105202441) and next prime (21003105202447).

It is a super-2 number, since 2×21003105202444² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003105202441) 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, 5353174 + ... + 8406109.

It is an arithmetic number, because the mean of its divisors is an integer number (1537187208480).

Almost surely, 2^{21003105202444} is an apocalyptic number.

It is an amenable number.

21003105202444 is a deficient number, since it is larger than the sum of its proper divisors (15889387801076).

21003105202444 is a wasteful number, since it uses less digits than its factorization.

21003105202444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760709 (or 13760707 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21003105202444 its reverse (44420250130012), we get a palindrome (65423355332456).

The spelling of 21003105202444 in words is "twenty-one trillion, three billion, one hundred five million, two hundred two thousand, four hundred forty-four".