1221111332013 has 16 divisors (see below), whose sum is σ = 1643181091200. Its totient is φ = 806558765760.

The previous prime is 1221111332011. The next prime is 1221111332017. The reversal of 1221111332013 is 3102331111221.

It is not a de Polignac number, because 1221111332013 - 2¹ = 1221111332011 is a prime.

It is a super-2 number, since 2×1221111332013² (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 (1221111332011) 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, 6061243 + ... + 6259463.

It is an arithmetic number, because the mean of its divisors is an integer number (102698818200).

Almost surely, 2^{1221111332013} is an apocalyptic number.

It is an amenable number.

1221111332013 is a deficient number, since it is larger than the sum of its proper divisors (422069759187).

1221111332013 is a wasteful number, since it uses less digits than its factorization.

1221111332013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217172.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1221111332013 its reverse (3102331111221), we get a palindrome (4323442443234).

The spelling of 1221111332013 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred thirty-two thousand, thirteen".