10212120021111 has 4 divisors (see below), whose sum is σ = 13616160028152. Its totient is φ = 6808080014072.

The previous prime is 10212120021091. The next prime is 10212120021127. The reversal of 10212120021111 is 11112002121201.

It is a happy number.

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 10212120021111 - 2²⁵ = 10212086466679 is a prime.

It is a super-2 number, since 2×10212120021111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212120021151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1702020003516 + ... + 1702020003521.

It is an arithmetic number, because the mean of its divisors is an integer number (3404040007038).

Almost surely, 2^{10212120021111} is an apocalyptic number.

10212120021111 is a deficient number, since it is larger than the sum of its proper divisors (3404040007041).

10212120021111 is an equidigital number, since it uses as much as digits as its factorization.

10212120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404040007040.

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

Adding to 10212120021111 its reverse (11112002121201), we get a palindrome (21324122142312).

The spelling of 10212120021111 in words is "ten trillion, two hundred twelve billion, one hundred twenty million, twenty-one thousand, one hundred eleven".