20210221121102 has 4 divisors (see below), whose sum is σ = 30315331681656. Its totient is φ = 10105110560550.

The previous prime is 20210221121099. The next prime is 20210221121117. The reversal of 20210221121102 is 20112112201202.

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

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5052555280274 + ... + 5052555280277.

It is an arithmetic number, because the mean of its divisors is an integer number (7578832920414).

Almost surely, 2^{20210221121102} is an apocalyptic number.

20210221121102 is a deficient number, since it is larger than the sum of its proper divisors (10105110560554).

20210221121102 is a wasteful number, since it uses less digits than its factorization.

20210221121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105110560553.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20210221121102 its reverse (20112112201202), we get a palindrome (40322333322304).

The spelling of 20210221121102 in words is "twenty trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred two".