21045100411 has 4 divisors (see below), whose sum is σ = 22283047512. Its totient is φ = 19807153312.

The previous prime is 21045100379. The next prime is 21045100423. The reversal of 21045100411 is 11400154012.

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 21045100411 - 2⁵ = 21045100379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21045100481) 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, 618973525 + ... + 618973558.

It is an arithmetic number, because the mean of its divisors is an integer number (5570761878).

Almost surely, 2^21045100411 is an apocalyptic number.

21045100411 is a deficient number, since it is larger than the sum of its proper divisors (1237947101).

21045100411 is a wasteful number, since it uses less digits than its factorization.

21045100411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237947100.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21045100411 its reverse (11400154012), we get a palindrome (32445254423).

The spelling of 21045100411 in words is "twenty-one billion, forty-five million, one hundred thousand, four hundred eleven".