21202201221012 has 144 divisors (see below), whose sum is σ = 61524760332672. Its totient is φ = 6030686545920.

The previous prime is 21202201220969. The next prime is 21202201221029. The reversal of 21202201221012 is 21012210220212.

It is a happy number.

21202201221012 is a `hidden beast` number, since 212 + 0 + 220 + 1 + 221 + 0 + 12 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 359958348 + ... + 360017244.

It is an arithmetic number, because the mean of its divisors is an integer number (427255280088).

Almost surely, 2^{21202201221012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202201221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30762380166336).

21202201221012 is an abundant number, since it is smaller than the sum of its proper divisors (40322559111660).

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

21202201221012 is a wasteful number, since it uses less digits than its factorization.

21202201221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65278 (or 65273 counting only the distinct ones).

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

Adding to 21202201221012 its reverse (21012210220212), we get a palindrome (42214411441224).

The spelling of 21202201221012 in words is "twenty-one trillion, two hundred two billion, two hundred one million, two hundred twenty-one thousand, twelve".