20212121121202 has 16 divisors (see below), whose sum is σ = 30542058630720. Its totient is φ = 10031462342352.

The previous prime is 20212121121197. The next prime is 20212121121209. The reversal of 20212121121202 is 20212112121202.

It is a self number, because there is not a number n which added to its sum of digits gives 20212121121202.

It is not an unprimeable number, because it can be changed into a prime (20212121121209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5380893 + ... + 8329360.

It is an arithmetic number, because the mean of its divisors is an integer number (1908878664420).

Almost surely, 2^{20212121121202} is an apocalyptic number.

20212121121202 is a deficient number, since it is larger than the sum of its proper divisors (10329937509518).

20212121121202 is a wasteful number, since it uses less digits than its factorization.

20212121121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13715697.

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

Adding to 20212121121202 its reverse (20212112121202), we get a palindrome (40424233242404).

Subtracting from 20212121121202 its reverse (20212112121202), we obtain a square (9000000 = 3000²).

The spelling of 20212121121202 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred two".