1321221300121 has 16 divisors (see below), whose sum is σ = 1357203513600. Its totient is φ = 1285479901440.

The previous prime is 1321221300103. The next prime is 1321221300137. The reversal of 1321221300121 is 1210031221231.

It is a cyclic number.

It is not a de Polignac number, because 1321221300121 - 2¹¹ = 1321221298073 is a prime.

It is a super-2 number, since 2×1321221300121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321221300101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90804555 + ... + 90819103.

It is an arithmetic number, because the mean of its divisors is an integer number (84825219600).

Almost surely, 2^{1321221300121} is an apocalyptic number.

It is an amenable number.

1321221300121 is a deficient number, since it is larger than the sum of its proper divisors (35982213479).

1321221300121 is a wasteful number, since it uses less digits than its factorization.

1321221300121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321221300121 its reverse (1210031221231), we get a palindrome (2531252521352).

The spelling of 1321221300121 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred thousand, one hundred twenty-one".