10211212221111 has 12 divisors (see below), whose sum is σ = 16090395015240. Its totient is φ = 6188613467280.

The previous prime is 10211212221029. The next prime is 10211212221139. The reversal of 10211212221111 is 11112221211201.

It is a happy number.

10211212221111 is a `hidden beast` number, since 10 + 211 + 212 + 221 + 1 + 11 = 666.

It is not a de Polignac number, because 10211212221111 - 2¹¹ = 10211212219063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211212221151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51571778796 + ... + 51571778993.

It is an arithmetic number, because the mean of its divisors is an integer number (1340866251270).

Almost surely, 2^{10211212221111} is an apocalyptic number.

10211212221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10211212221111 is a deficient number, since it is larger than the sum of its proper divisors (5879182794129).

10211212221111 is a wasteful number, since it uses less digits than its factorization.

10211212221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103143557806 (or 103143557803 counting only the distinct ones).

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

Adding to 10211212221111 its reverse (11112221211201), we get a palindrome (21323433432312).

The spelling of 10211212221111 in words is "ten trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".