21144142122 has 32 divisors (see below), whose sum is σ = 44858712384. Its totient is φ = 6621177600.

The previous prime is 21144142093. The next prime is 21144142231. The reversal of 21144142122 is 22124144112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21144142092 and 21144142101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136404 + ... + 246767.

It is an arithmetic number, because the mean of its divisors is an integer number (1401834762).

Almost surely, 2^21144142122 is an apocalyptic number.

21144142122 is an abundant number, since it is smaller than the sum of its proper divisors (23714570262).

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

21144142122 is a wasteful number, since it uses less digits than its factorization.

21144142122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383734.

The product of its digits is 1024, while the sum is 24.

Adding to 21144142122 its reverse (22124144112), we get a palindrome (43268286234).

The spelling of 21144142122 in words is "twenty-one billion, one hundred forty-four million, one hundred forty-two thousand, one hundred twenty-two".