21002212202111 has 8 divisors (see below), whose sum is σ = 25414441656480. Its totient is φ = 16942961104128.

The previous prime is 21002212202063. The next prime is 21002212202129. The reversal of 21002212202111 is 11120221220012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002212202111 - 2¹⁸ = 21002211939967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21002212202111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002212202161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88244588966 + ... + 88244589203.

It is an arithmetic number, because the mean of its divisors is an integer number (3176805207060).

Almost surely, 2^{21002212202111} is an apocalyptic number.

21002212202111 is a deficient number, since it is larger than the sum of its proper divisors (4412229454369).

21002212202111 is a wasteful number, since it uses less digits than its factorization.

21002212202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176489178193.

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

Adding to 21002212202111 its reverse (11120221220012), we get a palindrome (32122433422123).

The spelling of 21002212202111 in words is "twenty-one trillion, two billion, two hundred twelve million, two hundred two thousand, one hundred eleven".