21221021022202 has 8 divisors (see below), whose sum is σ = 31831635395412. Its totient is φ = 10610475890400.

The previous prime is 21221021022167. The next prime is 21221021022203. The reversal of 21221021022202 is 20222012012212.

It can be written as a sum of positive squares in 2 ways, for example, as 17851377057921 + 3369643964281 = 4225089^2 + 1835659^2 .

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 21221021022202.

It is not an unprimeable number, because it can be changed into a prime (21221021022203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16537249 + ... + 17774212.

Almost surely, 2^{21221021022202} is an apocalyptic number.

21221021022202 is a deficient number, since it is larger than the sum of its proper divisors (10610614373210).

21221021022202 is a wasteful number, since it uses less digits than its factorization.

21221021022202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34620704.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21221021022202 its reverse (20222012012212), we get a palindrome (41443033034414).

The spelling of 21221021022202 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, twenty-two thousand, two hundred two".