11211002001221 has 12 divisors (see below), whose sum is σ = 12435890474700. Its totient is φ = 10098317053440.

The previous prime is 11211002001211. The next prime is 11211002001229. The reversal of 11211002001221 is 12210020011211.

It can be written as a sum of positive squares in 2 ways, for example, as 3695256513025 + 7515745488196 = 1922305^2 + 2741486^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11211002001221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211002001196 and 11211002001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211002001229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425000156 + ... + 425026533.

It is an arithmetic number, because the mean of its divisors is an integer number (1036324206225).

Almost surely, 2^{11211002001221} is an apocalyptic number.

11211002001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211002001221 is a deficient number, since it is larger than the sum of its proper divisors (1224888473479).

11211002001221 is a wasteful number, since it uses less digits than its factorization.

11211002001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850026820 (or 850026809 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11211002001221 its reverse (12210020011211), we get a palindrome (23421022012432).

The spelling of 11211002001221 in words is "eleven trillion, two hundred eleven billion, two million, one thousand, two hundred twenty-one".