22121004042 has 32 divisors (see below), whose sum is σ = 49644509760. Its totient is φ = 7300659600.

The previous prime is 22121004007. The next prime is 22121004053. The reversal of 22121004042 is 24040012122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2022508 + ... + 2033415.

It is an arithmetic number, because the mean of its divisors is an integer number (1551390930).

Almost surely, 2^22121004042 is an apocalyptic number.

22121004042 is an abundant number, since it is smaller than the sum of its proper divisors (27523505718).

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

22121004042 is a wasteful number, since it uses less digits than its factorization.

22121004042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056035 (or 4056029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22121004042 its reverse (24040012122), we get a palindrome (46161016164).

The spelling of 22121004042 in words is "twenty-two billion, one hundred twenty-one million, four thousand, forty-two".