1221122011213 has 8 divisors (see below), whose sum is σ = 1315082141856. Its totient is φ = 1127165833200.

The previous prime is 1221122011199. The next prime is 1221122011253. The reversal of 1221122011213 is 3121102211221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221122011213 - 2⁵ = 1221122011181 is a prime.

It is a super-2 number, since 2×1221122011213² (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 (1221122011253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330283 + ... + 1597288.

It is an arithmetic number, because the mean of its divisors is an integer number (164385267732).

Almost surely, 2^{1221122011213} is an apocalyptic number.

1221122011213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221122011213 is a deficient number, since it is larger than the sum of its proper divisors (93960130643).

1221122011213 is a wasteful number, since it uses less digits than its factorization.

1221122011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976315.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1221122011213 its reverse (3121102211221), we get a palindrome (4342224222434).

The spelling of 1221122011213 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, eleven thousand, two hundred thirteen".