21201222210072 has 32 divisors (see below), whose sum is σ = 54235684726080. Its totient is φ = 6902723509920.

The previous prime is 21201222210061. The next prime is 21201222210073. The reversal of 21201222210072 is 27001222210212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201222210073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10271908954 + ... + 10271911017.

It is an arithmetic number, because the mean of its divisors is an integer number (1694865147690).

Almost surely, 2^{21201222210072} is an apocalyptic number.

It is an amenable number.

21201222210072 is an abundant number, since it is smaller than the sum of its proper divisors (33034462516008).

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

21201222210072 is a wasteful number, since it uses less digits than its factorization.

21201222210072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20543820023 (or 20543820019 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

Adding to 21201222210072 its reverse (27001222210212), we get a palindrome (48202444420284).

The spelling of 21201222210072 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred ten thousand, seventy-two".