20211221211022 has 4 divisors (see below), whose sum is σ = 30316831816536. Its totient is φ = 10105610605510.

The previous prime is 20211221210981. The next prime is 20211221211037. The reversal of 20211221211022 is 22011212211202.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5052805302754 + ... + 5052805302757.

It is an arithmetic number, because the mean of its divisors is an integer number (7579207954134).

Almost surely, 2^{20211221211022} is an apocalyptic number.

20211221211022 is a deficient number, since it is larger than the sum of its proper divisors (10105610605514).

20211221211022 is a wasteful number, since it uses less digits than its factorization.

20211221211022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105610605513.

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

Adding to 20211221211022 its reverse (22011212211202), we get a palindrome (42222433422224).

The spelling of 20211221211022 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, twenty-two".