1221211100013 has 16 divisors (see below), whose sum is σ = 1641905395200. Its totient is φ = 807342410160.

The previous prime is 1221211099957. The next prime is 1221211100017. The reversal of 1221211100013 is 3100011121221.

It is not a de Polignac number, because 1221211100013 - 2⁶ = 1221211099949 is a prime.

It is a super-2 number, since 2×1221211100013² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221211099965 and 1221211100001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211100017) 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, 1346433 + ... + 2062838.

It is an arithmetic number, because the mean of its divisors is an integer number (102619087200).

Almost surely, 2^{1221211100013} is an apocalyptic number.

It is an amenable number.

1221211100013 is a deficient number, since it is larger than the sum of its proper divisors (420694295187).

1221211100013 is a wasteful number, since it uses less digits than its factorization.

1221211100013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410272.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1221211100013 its reverse (3100011121221), we get a palindrome (4321222221234).

The spelling of 1221211100013 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred thousand, thirteen".