21022121121202 has 8 divisors (see below), whose sum is σ = 31535070738156. Its totient is φ = 10510430875152.

The previous prime is 21022121121163. The next prime is 21022121121263. The reversal of 21022121121202 is 20212112122012.

It can be written as a sum of positive squares in 2 ways, for example, as 18940417539481 + 2081703581721 = 4352059^2 + 1442811^2 .

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 21022121121202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314800993 + ... + 314867764.

Almost surely, 2^{21022121121202} is an apocalyptic number.

21022121121202 is a deficient number, since it is larger than the sum of its proper divisors (10512949616954).

21022121121202 is a wasteful number, since it uses less digits than its factorization.

21022121121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629685452.

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

Adding to 21022121121202 its reverse (20212112122012), we get a palindrome (41234233243214).

The spelling of 21022121121202 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred two".