1221012110211 has 16 divisors (see below), whose sum is σ = 1672291567008. Its totient is φ = 791877600000.

The previous prime is 1221012110183. The next prime is 1221012110233. The reversal of 1221012110211 is 1120112101221.

It is a happy number.

It is not a de Polignac number, because 1221012110211 - 2²¹ = 1221010013059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221012114211) 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, 224290 + ... + 1578711.

It is an arithmetic number, because the mean of its divisors is an integer number (104518222938).

Almost surely, 2^{1221012110211} is an apocalyptic number.

1221012110211 is a deficient number, since it is larger than the sum of its proper divisors (451279456797).

1221012110211 is a wasteful number, since it uses less digits than its factorization.

1221012110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809142.

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

Adding to 1221012110211 its reverse (1120112101221), we get a palindrome (2341124211432).

The spelling of 1221012110211 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred ten thousand, two hundred eleven".