1221102123011 has 8 divisors (see below), whose sum is σ = 1267025444400. Its totient is φ = 1175433225120.

The previous prime is 1221102123001. The next prime is 1221102123041. The reversal of 1221102123011 is 1103212011221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221102123011 is a prime.

It is a super-2 number, since 2×1221102123011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102123001) 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, 63596096 + ... + 63615293.

It is an arithmetic number, because the mean of its divisors is an integer number (158378180550).

Almost surely, 2^{1221102123011} is an apocalyptic number.

1221102123011 is a deficient number, since it is larger than the sum of its proper divisors (45923321389).

1221102123011 is a wasteful number, since it uses less digits than its factorization.

1221102123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127211749.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221102123011 its reverse (1103212011221), we get a palindrome (2324314134232).

The spelling of 1221102123011 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty-three thousand, eleven".