21022021202111 has 4 divisors (see below), whose sum is σ = 21238743070272. Its totient is φ = 20805299333952.

The previous prime is 21022021202047. The next prime is 21022021202153. The reversal of 21022021202111 is 11120212022012.

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

It is a cyclic number.

It is not a de Polignac number, because 21022021202111 - 2⁶ = 21022021202047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022021202111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022021202311) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 108360933935 + ... + 108360934128.

It is an arithmetic number, because the mean of its divisors is an integer number (5309685767568).

Almost surely, 2^{21022021202111} is an apocalyptic number.

21022021202111 is a deficient number, since it is larger than the sum of its proper divisors (216721868161).

21022021202111 is an equidigital number, since it uses as much as digits as its factorization.

21022021202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216721868160.

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

Adding to 21022021202111 its reverse (11120212022012), we get a palindrome (32142233224123).

The spelling of 21022021202111 in words is "twenty-one trillion, twenty-two billion, twenty-one million, two hundred two thousand, one hundred eleven".