21010102122111 has 8 divisors (see below), whose sum is σ = 28013613212544. Its totient is φ = 14006662889880.

The previous prime is 21010102122109. The next prime is 21010102122151. The reversal of 21010102122111 is 11122120101012.

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 21010102122111 - 2¹ = 21010102122109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010102122151) 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, 17278581 + ... + 18454526.

It is an arithmetic number, because the mean of its divisors is an integer number (3501701651568).

Almost surely, 2^{21010102122111} is an apocalyptic number.

21010102122111 is a deficient number, since it is larger than the sum of its proper divisors (7003511090433).

21010102122111 is a wasteful number, since it uses less digits than its factorization.

21010102122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35929101.

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

Adding to 21010102122111 its reverse (11122120101012), we get a palindrome (32132222223123).

The spelling of 21010102122111 in words is "twenty-one trillion, ten billion, one hundred two million, one hundred twenty-two thousand, one hundred eleven".