21120021002122 has 32 divisors (see below), whose sum is σ = 36945999936000. Its totient is φ = 9051105160944.

The previous prime is 21120021002083. The next prime is 21120021002273. The reversal of 21120021002122 is 22120012002112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21120021002096 and 21120021002105.

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, 18601068 + ... + 19703800.

It is an arithmetic number, because the mean of its divisors is an integer number (1154562498000).

Almost surely, 2^{21120021002122} is an apocalyptic number.

21120021002122 is a deficient number, since it is larger than the sum of its proper divisors (15825978933878).

21120021002122 is a wasteful number, since it uses less digits than its factorization.

21120021002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130675 (or 1130661 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120021002122 its reverse (22120012002112), we get a palindrome (43240033004234).

The spelling of 21120021002122 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two thousand, one hundred twenty-two".