10212111 has 48 divisors (see below), whose sum is σ = 18700864. Its totient is φ = 5225472.

The previous prime is 10212077. The next prime is 10212119. The reversal of 10212111 is 11121201.

It is a happy number.

It is not a de Polignac number, because 10212111 - 2⁷ = 10211983 is a prime.

It is a super-2 number, since 2×10212111² = 208574422152642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10212093 and 10212102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30135 + ... + 30471.

Almost surely, 2^10212111 is an apocalyptic number.

10212111 is a deficient number, since it is larger than the sum of its proper divisors (8488753).

10212111 is a wasteful number, since it uses less digits than its factorization.

10212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 10212111 is about 3195.6393726452. The cubic root of 10212111 is about 216.9560884340.

Adding to 10212111 its reverse (11121201), we get a palindrome (21333312).

The spelling of 10212111 in words is "ten million, two hundred twelve thousand, one hundred eleven".