10211221212111 has 24 divisors (see below), whose sum is σ = 15643134819936. Its totient is φ = 6404757416640.

The previous prime is 10211221212109. The next prime is 10211221212131. The reversal of 10211221212111 is 11121212211201.

It is a happy number.

10211221212111 is a `hidden beast` number, since 1 + 0 + 211 + 221 + 21 + 211 + 1 = 666.

It is not a de Polignac number, because 10211221212111 - 2¹ = 10211221212109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211221212131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 404328120 + ... + 404353373.

It is an arithmetic number, because the mean of its divisors is an integer number (651797284164).

Almost surely, 2^{10211221212111} is an apocalyptic number.

10211221212111 is a deficient number, since it is larger than the sum of its proper divisors (5431913607825).

10211221212111 is a wasteful number, since it uses less digits than its factorization.

10211221212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808681583 (or 808681580 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 10211221212111 its reverse (11121212211201), we get a palindrome (21332433423312).

The spelling of 10211221212111 in words is "ten trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".