1221110101503 has 6 divisors (see below), whose sum is σ = 1763825702184. Its totient is φ = 814073400996.

The previous prime is 1221110101459. The next prime is 1221110101517. The reversal of 1221110101503 is 3051010111221.

It is not a de Polignac number, because 1221110101503 - 2⁸ = 1221110101247 is a prime.

It is a super-2 number, since 2×1221110101503² (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 (1221110101583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67839450075 + ... + 67839450092.

It is an arithmetic number, because the mean of its divisors is an integer number (293970950364).

Almost surely, 2^{1221110101503} is an apocalyptic number.

1221110101503 is a deficient number, since it is larger than the sum of its proper divisors (542715600681).

1221110101503 is a wasteful number, since it uses less digits than its factorization.

1221110101503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135678900173 (or 135678900170 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

Adding to 1221110101503 its reverse (3051010111221), we get a palindrome (4272120212724).

The spelling of 1221110101503 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred one thousand, five hundred three".