1221320100011 has 8 divisors (see below), whose sum is σ = 1375328206848. Its totient is φ = 1074475161000.

The previous prime is 1221320100001. The next prime is 1221320100031. The reversal of 1221320100011 is 1100010231221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221320100011 - 2⁶ = 1221320099947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221320100001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1790791595 + ... + 1790792276.

It is an arithmetic number, because the mean of its divisors is an integer number (171916025856).

Almost surely, 2^{1221320100011} is an apocalyptic number.

1221320100011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221320100011 is a deficient number, since it is larger than the sum of its proper divisors (154008106837).

1221320100011 is a wasteful number, since it uses less digits than its factorization.

1221320100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581583913.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221320100011 its reverse (1100010231221), we get a palindrome (2321330331232).

The spelling of 1221320100011 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, one hundred thousand, eleven".