21121031110143 has 8 divisors (see below), whose sum is σ = 29385782414208. Its totient is φ = 13468483606424.

The previous prime is 21121031110093. The next prime is 21121031110159. The reversal of 21121031110143 is 34101113012112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21121031110143 - 2⁶ = 21121031110079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121031110643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153050950005 + ... + 153050950142.

It is an arithmetic number, because the mean of its divisors is an integer number (3673222801776).

Almost surely, 2^{21121031110143} is an apocalyptic number.

21121031110143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21121031110143 is a deficient number, since it is larger than the sum of its proper divisors (8264751304065).

21121031110143 is a wasteful number, since it uses less digits than its factorization.

21121031110143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306101900173.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21121031110143 its reverse (34101113012112), we get a palindrome (55222144122255).

The spelling of 21121031110143 in words is "twenty-one trillion, one hundred twenty-one billion, thirty-one million, one hundred ten thousand, one hundred forty-three".