21201222001122 has 16 divisors (see below), whose sum is σ = 47113826669280. Its totient is φ = 7067074000356.

The previous prime is 21201222001111. The next prime is 21201222001139. The reversal of 21201222001122 is 22110022210212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21201222001095 and 21201222001104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196307611068 + ... + 196307611175.

It is an arithmetic number, because the mean of its divisors is an integer number (2944614166830).

Almost surely, 2^{21201222001122} is an apocalyptic number.

21201222001122 is an abundant number, since it is smaller than the sum of its proper divisors (25912604668158).

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

21201222001122 is a wasteful number, since it uses less digits than its factorization.

21201222001122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392615222254 (or 392615222248 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21201222001122 its reverse (22110022210212), we get a palindrome (43311244211334).

The spelling of 21201222001122 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one thousand, one hundred twenty-two".