21002122221122 has 32 divisors (see below), whose sum is σ = 37017870994944. Its totient is φ = 8748971481600.

The previous prime is 21002122221107. The next prime is 21002122221131. The reversal of 21002122221122 is 22112222120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002122221094 and 21002122221103.

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, 67351943 + ... + 67663050.

It is an arithmetic number, because the mean of its divisors is an integer number (1156808468592).

Almost surely, 2^{21002122221122} is an apocalyptic number.

21002122221122 is a deficient number, since it is larger than the sum of its proper divisors (16015748773822).

21002122221122 is a wasteful number, since it uses less digits than its factorization.

21002122221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135015314.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21002122221122 its reverse (22112222120012), we get a palindrome (43114344341134).

The spelling of 21002122221122 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-two".