1221210110123 has 32 divisors (see below), whose sum is σ = 1278310505472. Its totient is φ = 1165898448000.

The previous prime is 1221210110101. The next prime is 1221210110207. The reversal of 1221210110123 is 3210110121221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221210110123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221210118123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97046090 + ... + 97058672.

It is an arithmetic number, because the mean of its divisors is an integer number (39947203296).

Almost surely, 2^{1221210110123} is an apocalyptic number.

1221210110123 is a deficient number, since it is larger than the sum of its proper divisors (57100395349).

1221210110123 is a wasteful number, since it uses less digits than its factorization.

1221210110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13035.

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

Adding to 1221210110123 its reverse (3210110121221), we get a palindrome (4431320231344).

The spelling of 1221210110123 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred ten thousand, one hundred twenty-three".