21202010121111 has 8 divisors (see below), whose sum is σ = 28269621070704. Its totient is φ = 14134536292800.

The previous prime is 21202010121109. The next prime is 21202010121119. The reversal of 21202010121111 is 11112101020212.

It is a happy number.

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

It is not a de Polignac number, because 21202010121111 - 2¹ = 21202010121109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202010121119) 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, 33918990 + ... + 34538411.

It is an arithmetic number, because the mean of its divisors is an integer number (3533702633838).

Almost surely, 2^{21202010121111} is an apocalyptic number.

21202010121111 is a deficient number, since it is larger than the sum of its proper divisors (7067610949593).

21202010121111 is a wasteful number, since it uses less digits than its factorization.

21202010121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68560641.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21202010121111 its reverse (11112101020212), we get a palindrome (32314111141323).

The spelling of 21202010121111 in words is "twenty-one trillion, two hundred two billion, ten million, one hundred twenty-one thousand, one hundred eleven".