21201212201022 has 96 divisors (see below), whose sum is σ = 55338168038400. Its totient is φ = 5730692048064.

The previous prime is 21201212201011. The next prime is 21201212201023. The reversal of 21201212201022 is 22010221210212.

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 = 21201212200986 and 21201212201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201212201023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4437253 + ... + 7879824.

It is an arithmetic number, because the mean of its divisors is an integer number (576439250400).

Almost surely, 2^{21201212201022} is an apocalyptic number.

21201212201022 is an abundant number, since it is smaller than the sum of its proper divisors (34136955837378).

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

21201212201022 is a wasteful number, since it uses less digits than its factorization.

21201212201022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12317830 (or 12317827 counting only the distinct ones).

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

Adding to 21201212201022 its reverse (22010221210212), we get a palindrome (43211433411234).

The spelling of 21201212201022 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, two hundred one thousand, twenty-two".