21201122001022 has 16 divisors (see below), whose sum is σ = 32097235686912. Its totient is φ = 10502310063960.

The previous prime is 21201122000959. The next prime is 21201122001029. The reversal of 21201122001022 is 22010022110212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21201122000987 and 21201122001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122001029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66496908 + ... + 66814975.

It is an arithmetic number, because the mean of its divisors is an integer number (2006077230432).

Almost surely, 2^{21201122001022} is an apocalyptic number.

21201122001022 is a deficient number, since it is larger than the sum of its proper divisors (10896113685890).

21201122001022 is a wasteful number, since it uses less digits than its factorization.

21201122001022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133312623.

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

Adding to 21201122001022 its reverse (22010022110212), we get a palindrome (43211144111234).

The spelling of 21201122001022 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, one thousand, twenty-two".