21473556105 has 16 divisors (see below), whose sum is σ = 34505153280. Its totient is φ = 11403408768.

The previous prime is 21473556089. The next prime is 21473556107. The reversal of 21473556105 is 50165537412.

It is not a de Polignac number, because 21473556105 - 2⁴ = 21473556089 is a prime.

It is a super-2 number, since 2×21473556105² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21473556107) 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, 3068545 + ... + 3075534.

It is an arithmetic number, because the mean of its divisors is an integer number (2156572080).

Almost surely, 2^21473556105 is an apocalyptic number.

It is an amenable number.

21473556105 is a deficient number, since it is larger than the sum of its proper divisors (13031597175).

21473556105 is a wasteful number, since it uses less digits than its factorization.

21473556105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6144320.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21473556105 in words is "twenty-one billion, four hundred seventy-three million, five hundred fifty-six thousand, one hundred five".