21121031110144 has 80 divisors (see below), whose sum is σ = 48671970732000. Its totient is φ = 8968825626624.

The previous prime is 21121031110093. The next prime is 21121031110159. The reversal of 21121031110144 is 44101113012112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26642119 + ... + 27423430.

It is an arithmetic number, because the mean of its divisors is an integer number (608399634150).

Almost surely, 2^{21121031110144} is an apocalyptic number.

It is an amenable number.

21121031110144 is an abundant number, since it is smaller than the sum of its proper divisors (27550939621856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121031110144 is an equidigital number, since it uses as much as digits as its factorization.

21121031110144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54065683 (or 54065667 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 21121031110144 its reverse (44101113012112), we get a palindrome (65222144122256).

The spelling of 21121031110144 in words is "twenty-one trillion, one hundred twenty-one billion, thirty-one million, one hundred ten thousand, one hundred forty-four".