1221354142005 has 16 divisors (see below), whose sum is σ = 1954227268224. Its totient is φ = 651368662080.

The previous prime is 1221354141883. The next prime is 1221354142039. The reversal of 1221354142005 is 5002414531221.

It is not a de Polignac number, because 1221354142005 - 2⁹ = 1221354141493 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757326 + ... + 1736735.

It is an arithmetic number, because the mean of its divisors is an integer number (122139204264).

Almost surely, 2^{1221354142005} is an apocalyptic number.

1221354142005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221354142005 is a deficient number, since it is larger than the sum of its proper divisors (732873126219).

1221354142005 is a wasteful number, since it uses less digits than its factorization.

1221354142005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526716.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1221354142005 its reverse (5002414531221), we get a palindrome (6223768673226).

The spelling of 1221354142005 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-four million, one hundred forty-two thousand, five".