21001222001122 has 128 divisors (see below), whose sum is σ = 37620977264640. Its totient is φ = 8684644469760.

The previous prime is 21001222001119. The next prime is 21001222001129. The reversal of 21001222001122 is 22110022210012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001222001096 and 21001222001105.

It is not an unprimeable number, because it can be changed into a prime (21001222001129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 615006853 + ... + 615040999.

It is an arithmetic number, because the mean of its divisors is an integer number (293913884880).

Almost surely, 2^{21001222001122} is an apocalyptic number.

21001222001122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001222001122 is a deficient number, since it is larger than the sum of its proper divisors (16619755263518).

21001222001122 is a wasteful number, since it uses less digits than its factorization.

21001222001122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34616.

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

Adding to 21001222001122 its reverse (22110022210012), we get a palindrome (43111244211134).

The spelling of 21001222001122 in words is "twenty-one trillion, one billion, two hundred twenty-two million, one thousand, one hundred twenty-two".