21152155121143 has 12 divisors (see below), whose sum is σ = 22440553125312. Its totient is φ = 19916588914560.

The previous prime is 21152155121137. The next prime is 21152155121177. The reversal of 21152155121143 is 34112155125112.

It is a de Polignac number, because none of the positive numbers 2^k-21152155121143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152155121099 and 21152155121108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152155151143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249164130 + ... + 249249007.

It is an arithmetic number, because the mean of its divisors is an integer number (1870046093776).

Almost surely, 2^{21152155121143} is an apocalyptic number.

21152155121143 is a deficient number, since it is larger than the sum of its proper divisors (1288398004169).

21152155121143 is an equidigital number, since it uses as much as digits as its factorization.

21152155121143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498413242 (or 498413205 counting only the distinct ones).

The product of its digits is 12000, while the sum is 34.

The spelling of 21152155121143 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-five million, one hundred twenty-one thousand, one hundred forty-three".