20021021202111 has 16 divisors (see below), whose sum is σ = 27591133054464. Its totient is φ = 12905971448384.

The previous prime is 20021021202101. The next prime is 20021021202151. The reversal of 20021021202111 is 11120212012002.

It is a cyclic number.

It is not a de Polignac number, because 20021021202111 - 2¹⁴ = 20021021185727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021202101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855368166 + ... + 855391571.

It is an arithmetic number, because the mean of its divisors is an integer number (1724445815904).

Almost surely, 2^{20021021202111} is an apocalyptic number.

20021021202111 is a deficient number, since it is larger than the sum of its proper divisors (7570111852353).

20021021202111 is a wasteful number, since it uses less digits than its factorization.

20021021202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710759870.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021021202111 its reverse (11120212012002), we get a palindrome (31141233214113).

The spelling of 20021021202111 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred two thousand, one hundred eleven".