20010221202122 has 4 divisors (see below), whose sum is σ = 30015331803186. Its totient is φ = 10005110601060.

The previous prime is 20010221202121. The next prime is 20010221202133. The reversal of 20010221202122 is 22120212201002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19838908819921 + 171312382201 = 4454089^2 + 413899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20010221202122.

It is not an unprimeable number, because it can be changed into a prime (20010221202121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002555300529 + ... + 5002555300532.

Almost surely, 2^{20010221202122} is an apocalyptic number.

20010221202122 is a deficient number, since it is larger than the sum of its proper divisors (10005110601064).

20010221202122 is a wasteful number, since it uses less digits than its factorization.

20010221202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005110601063.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20010221202122 its reverse (22120212201002), we get a palindrome (42130433403124).

The spelling of 20010221202122 in words is "twenty trillion, ten billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-two".