10001221011 has 16 divisors (see below), whose sum is σ = 14821153920. Its totient is φ = 6665442120.

The previous prime is 10001221003. The next prime is 10001221019. The reversal of 10001221011 is 11012210001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10001221003) and next prime (10001221019).

It is not a de Polignac number, because 10001221011 - 2³ = 10001221003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10001220984 and 10001221002.

It is not an unprimeable number, because it can be changed into a prime (10001221019) 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, 36076 + ... + 145958.

It is an arithmetic number, because the mean of its divisors is an integer number (926322120).

Almost surely, 2^10001221011 is an apocalyptic number.

10001221011 is a deficient number, since it is larger than the sum of its proper divisors (4819932909).

10001221011 is a wasteful number, since it uses less digits than its factorization.

10001221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113263 (or 113257 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10001221011 its reverse (11012210001), we get a palindrome (21013431012).

The spelling of 10001221011 in words is "ten billion, one million, two hundred twenty-one thousand, eleven".