21201212221102 has 8 divisors (see below), whose sum is σ = 31801842291456. Its totient is φ = 10600598123952.

The previous prime is 21201212221009. The next prime is 21201212221109. The reversal of 21201212221102 is 20112221210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21201212221102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201212221109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209683 + ... + 6515089.

It is an arithmetic number, because the mean of its divisors is an integer number (3975230286432).

Almost surely, 2^{21201212221102} is an apocalyptic number.

21201212221102 is a deficient number, since it is larger than the sum of its proper divisors (10600630070354).

21201212221102 is a wasteful number, since it uses less digits than its factorization.

21201212221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986602.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21201212221102 its reverse (20112221210212), we get a palindrome (41313433431314).

The spelling of 21201212221102 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred two".