21121322551153 has 8 divisors (see below), whose sum is σ = 23043125172960. Its totient is φ = 19199800327680.

The previous prime is 21121322551129. The next prime is 21121322551163. The reversal of 21121322551153 is 35115522312112.

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-21121322551153 is a prime.

It is a super-2 number, since 2×21121322551153² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121322551163) 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, 69942063 + ... + 70243396.

It is an arithmetic number, because the mean of its divisors is an integer number (2880390646620).

Almost surely, 2^{21121322551153} is an apocalyptic number.

It is an amenable number.

21121322551153 is a deficient number, since it is larger than the sum of its proper divisors (1921802621807).

21121322551153 is a wasteful number, since it uses less digits than its factorization.

21121322551153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140199167.

The product of its digits is 18000, while the sum is 34.

Adding to 21121322551153 its reverse (35115522312112), we get a palindrome (56236844863265).

The spelling of 21121322551153 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty-two million, five hundred fifty-one thousand, one hundred fifty-three".