10021121211221 has 16 divisors (see below), whose sum is σ = 10467005311488. Its totient is φ = 9576087721200.

The previous prime is 10021121211203. The next prime is 10021121211239. The reversal of 10021121211221 is 12211212112001.

It is an interprime number because it is at equal distance from previous prime (10021121211203) and next prime (10021121211239).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10021121211221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10021121211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021121211251) 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, 299774510 + ... + 299807936.

It is an arithmetic number, because the mean of its divisors is an integer number (654187831968).

Almost surely, 2^{10021121211221} is an apocalyptic number.

It is an amenable number.

10021121211221 is a deficient number, since it is larger than the sum of its proper divisors (445884100267).

10021121211221 is a wasteful number, since it uses less digits than its factorization.

10021121211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45752.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10021121211221 its reverse (12211212112001), we get a palindrome (22232333323222).

The spelling of 10021121211221 in words is "ten trillion, twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".