21261024135163 has 8 divisors (see below), whose sum is σ = 22512028310208. Its totient is φ = 20010059481984.

The previous prime is 21261024135137. The next prime is 21261024135209. The reversal of 21261024135163 is 36153142016212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21261024135163 is a prime.

It is a super-2 number, since 2×21261024135163² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21261024135103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8769331 + ... + 10928092.

It is an arithmetic number, because the mean of its divisors is an integer number (2814003538776).

Almost surely, 2^{21261024135163} is an apocalyptic number.

21261024135163 is a deficient number, since it is larger than the sum of its proper divisors (1251004175045).

21261024135163 is a wasteful number, since it uses less digits than its factorization.

21261024135163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19760933.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21261024135163 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-four million, one hundred thirty-five thousand, one hundred sixty-three".