1221011000011 has 4 divisors (see below), whose sum is σ = 1332012000024. Its totient is φ = 1110010000000.

The previous prime is 1221010999981. The next prime is 1221011000039. The reversal of 1221011000011 is 1100001101221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221011000011 - 2⁷ = 1221010999883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011000071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55500499990 + ... + 55500500011.

It is an arithmetic number, because the mean of its divisors is an integer number (333003000006).

Almost surely, 2^{1221011000011} is an apocalyptic number.

1221011000011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221011000011 is a deficient number, since it is larger than the sum of its proper divisors (111001000013).

1221011000011 is a wasteful number, since it uses less digits than its factorization.

1221011000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111001000012.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1221011000011 its reverse (1100001101221), we get a palindrome (2321012101232).

The spelling of 1221011000011 in words is "one trillion, two hundred twenty-one billion, eleven million, eleven", and thus it is an aban number.