20021021222111 has 12 divisors (see below), whose sum is σ = 25081279333992. Its totient is φ = 15840807999408.

The previous prime is 20021021222071. The next prime is 20021021222117. The reversal of 20021021222111 is 11122212012002.

It is not a de Polignac number, because 20021021222111 - 2³⁸ = 19746143315167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021021222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021222117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15715086665 + ... + 15715087938.

It is an arithmetic number, because the mean of its divisors is an integer number (2090106611166).

Almost surely, 2^{20021021222111} is an apocalyptic number.

20021021222111 is a deficient number, since it is larger than the sum of its proper divisors (5060258111881).

20021021222111 is a wasteful number, since it uses less digits than its factorization.

20021021222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430174630 (or 31430174623 counting only the distinct ones).

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

Adding to 20021021222111 its reverse (11122212012002), we get a palindrome (31143233234113).

The spelling of 20021021222111 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred eleven".