21101153120153 has 4 divisors (see below), whose sum is σ = 21103938023220. Its totient is φ = 21098368217088.

The previous prime is 21101153120147. The next prime is 21101153120171. The reversal of 21101153120153 is 35102135110112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1558272862864 + 19542880257289 = 1248308^2 + 4420733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101153120153 - 2²⁰ = 21101152071577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101153126153) 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, 1392440168 + ... + 1392455321.

It is an arithmetic number, because the mean of its divisors is an integer number (5275984505805).

Almost surely, 2^{21101153120153} is an apocalyptic number.

It is an amenable number.

21101153120153 is a deficient number, since it is larger than the sum of its proper divisors (2784903067).

21101153120153 is an equidigital number, since it uses as much as digits as its factorization.

21101153120153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784903066.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 21101153120153 its reverse (35102135110112), we get a palindrome (56203288230265).

The spelling of 21101153120153 in words is "twenty-one trillion, one hundred one billion, one hundred fifty-three million, one hundred twenty thousand, one hundred fifty-three".