1361221055103 has 32 divisors (see below), whose sum is σ = 2233865277952. Its totient is φ = 717985296000.

The previous prime is 1361221055087. The next prime is 1361221055203. The reversal of 1361221055103 is 3015501221631.

It is not a de Polignac number, because 1361221055103 - 2⁴ = 1361221055087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361221055203) 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, 13890828 + ... + 13988478.

It is an arithmetic number, because the mean of its divisors is an integer number (69808289936).

Almost surely, 2^{1361221055103} is an apocalyptic number.

1361221055103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1361221055103 is a deficient number, since it is larger than the sum of its proper divisors (872644222849).

1361221055103 is a wasteful number, since it uses less digits than its factorization.

1361221055103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148735.

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 1361221055103 its reverse (3015501221631), we get a palindrome (4376722276734).

The spelling of 1361221055103 in words is "one trillion, three hundred sixty-one billion, two hundred twenty-one million, fifty-five thousand, one hundred three".