21045400404101 has 16 divisors (see below), whose sum is σ = 22757812047360. Its totient is φ = 19385717410560.

The previous prime is 21045400404073. The next prime is 21045400404107. The reversal of 21045400404101 is 10140400454012.

It is a cyclic number.

It is not a de Polignac number, because 21045400404101 - 2¹⁴ = 21045400387717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045400404107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70898171 + ... + 71194391.

It is an arithmetic number, because the mean of its divisors is an integer number (1422363252960).

Almost surely, 2^{21045400404101} is an apocalyptic number.

It is an amenable number.

21045400404101 is a deficient number, since it is larger than the sum of its proper divisors (1712411643259).

21045400404101 is a wasteful number, since it uses less digits than its factorization.

21045400404101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385204.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21045400404101 its reverse (10140400454012), we get a palindrome (31185800858113).

The spelling of 21045400404101 in words is "twenty-one trillion, forty-five billion, four hundred million, four hundred four thousand, one hundred one".