21242042122 has 16 divisors (see below), whose sum is σ = 36499038912. Its totient is φ = 9082704960.

The previous prime is 21242042093. The next prime is 21242042131. The reversal of 21242042122 is 22124024212.

It is a junction number, because it is equal to n+sod(n) for n = 21242042093 and 21242042102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1746004 + ... + 1758127.

It is an arithmetic number, because the mean of its divisors is an integer number (2281189932).

Almost surely, 2^21242042122 is an apocalyptic number.

21242042122 is a deficient number, since it is larger than the sum of its proper divisors (15256996790).

21242042122 is a wasteful number, since it uses less digits than its factorization.

21242042122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504573.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21242042122 its reverse (22124024212), we get a palindrome (43366066334).

The spelling of 21242042122 in words is "twenty-one billion, two hundred forty-two million, forty-two thousand, one hundred twenty-two".