21503004002105 has 8 divisors (see below), whose sum is σ = 25805452355712. Its totient is φ = 17201171499568.

The previous prime is 21503004002089. The next prime is 21503004002113. The reversal of 21503004002105 is 50120040030512.

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

It is a cyclic number.

It is not a de Polignac number, because 21503004002105 - 2⁴ = 21503004002089 is a prime.

It is a super-2 number, since 2×21503004002105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153885947 + ... + 154025616.

It is an arithmetic number, because the mean of its divisors is an integer number (3225681544464).

Almost surely, 2^{21503004002105} is an apocalyptic number.

It is an amenable number.

21503004002105 is a deficient number, since it is larger than the sum of its proper divisors (4302448353607).

21503004002105 is a wasteful number, since it uses less digits than its factorization.

21503004002105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307925535.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21503004002105 its reverse (50120040030512), we get a palindrome (71623044032617).

The spelling of 21503004002105 in words is "twenty-one trillion, five hundred three billion, four million, two thousand, one hundred five".