1221012110011 has 16 divisors (see below), whose sum is σ = 1255931328960. Its totient is φ = 1186340359680.

The previous prime is 1221012109979. The next prime is 1221012110023. The reversal of 1221012110011 is 1100112101221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221012110011 - 2⁵ = 1221012109979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221012109973 and 1221012110000.

It is not an unprimeable number, because it can be changed into a prime (1221012113011) 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, 39590545 + ... + 39621373.

It is an arithmetic number, because the mean of its divisors is an integer number (78495708060).

Almost surely, 2^{1221012110011} is an apocalyptic number.

1221012110011 is a deficient number, since it is larger than the sum of its proper divisors (34919218949).

1221012110011 is a wasteful number, since it uses less digits than its factorization.

1221012110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34806.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221012110011 its reverse (1100112101221), we get a palindrome (2321124211232).

The spelling of 1221012110011 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred ten thousand, eleven".