1221201102123 has 32 divisors (see below), whose sum is σ = 1905109760000. Its totient is φ = 771000361056.

The previous prime is 1221201102119. The next prime is 1221201102179. The reversal of 1221201102123 is 3212011021221.

It is not a de Polignac number, because 1221201102123 - 2² = 1221201102119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221201102096 and 1221201102105.

It is not an unprimeable number, because it can be changed into a prime (1221201102103) 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, 957093 + ... + 1832601.

It is an arithmetic number, because the mean of its divisors is an integer number (59534680000).

Almost surely, 2^{1221201102123} is an apocalyptic number.

1221201102123 is a deficient number, since it is larger than the sum of its proper divisors (683908657877).

1221201102123 is a wasteful number, since it uses less digits than its factorization.

1221201102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878256 (or 878250 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1221201102123 its reverse (3212011021221), we get a palindrome (4433212123344).

The spelling of 1221201102123 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred two thousand, one hundred twenty-three".