21002112122 has 8 divisors (see below), whose sum is σ = 31527726336. Its totient is φ = 10492870012.

The previous prime is 21002112119. The next prime is 21002112143. The reversal of 21002112122 is 22121120012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21002112097 and 21002112106.

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 3 ways as a sum of consecutive naturals, for example, 4089818 + ... + 4094949.

It is an arithmetic number, because the mean of its divisors is an integer number (3940965792).

Almost surely, 2^21002112122 is an apocalyptic number.

21002112122 is a deficient number, since it is larger than the sum of its proper divisors (10525614214).

21002112122 is a wasteful number, since it uses less digits than its factorization.

21002112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186052.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002112122 its reverse (22121120012), we get a palindrome (43123232134).

The spelling of 21002112122 in words is "twenty-one billion, two million, one hundred twelve thousand, one hundred twenty-two".