1210212021111 has 16 divisors (see below), whose sum is σ = 1672431208800. Its totient is φ = 777800527488.

The previous prime is 1210212021071. The next prime is 1210212021143. The reversal of 1210212021111 is 1111202120121.

It is a happy number.

It is not a de Polignac number, because 1210212021111 - 2⁹ = 1210212020599 is a prime.

It is a super-2 number, since 2×1210212021111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210212020111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50000796 + ... + 50024993.

It is an arithmetic number, because the mean of its divisors is an integer number (104526950550).

Almost surely, 2^{1210212021111} is an apocalyptic number.

1210212021111 is a deficient number, since it is larger than the sum of its proper divisors (462219187689).

1210212021111 is a wasteful number, since it uses less digits than its factorization.

1210212021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100025938.

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

Adding to 1210212021111 its reverse (1111202120121), we get a palindrome (2321414141232).

The spelling of 1210212021111 in words is "one trillion, two hundred ten billion, two hundred twelve million, twenty-one thousand, one hundred eleven".