21105445413 has 16 divisors (see below), whose sum is σ = 32087918016. Its totient is φ = 12223968000.

The previous prime is 21105445409. The next prime is 21105445421. The reversal of 21105445413 is 31454450112.

It is not a de Polignac number, because 21105445413 - 2² = 21105445409 is a prime.

It is a super-2 number, since 2×21105445413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105445433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15915963 + ... + 15917288.

It is an arithmetic number, because the mean of its divisors is an integer number (2005494876).

Almost surely, 2^21105445413 is an apocalyptic number.

It is an amenable number.

21105445413 is a deficient number, since it is larger than the sum of its proper divisors (10982472603).

21105445413 is a wasteful number, since it uses less digits than its factorization.

21105445413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31833284.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21105445413 its reverse (31454450112), we get a palindrome (52559895525).

The spelling of 21105445413 in words is "twenty-one billion, one hundred five million, four hundred forty-five thousand, four hundred thirteen".