1221110101213 has 16 divisors (see below), whose sum is σ = 1279663862400. Its totient is φ = 1163012843520.

The previous prime is 1221110101207. The next prime is 1221110101217. The reversal of 1221110101213 is 3121010111221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221110101213 is a prime.

It is a super-2 number, since 2×1221110101213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110101217) 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, 69494893 + ... + 69512461.

It is an arithmetic number, because the mean of its divisors is an integer number (79978991400).

Almost surely, 2^{1221110101213} is an apocalyptic number.

It is an amenable number.

1221110101213 is a deficient number, since it is larger than the sum of its proper divisors (58553761187).

1221110101213 is a wasteful number, since it uses less digits than its factorization.

1221110101213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30372.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221110101213 its reverse (3121010111221), we get a palindrome (4342120212434).

The spelling of 1221110101213 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred one thousand, two hundred thirteen".