10202121111221 has 8 divisors (see below), whose sum is σ = 10989383758080. Its totient is φ = 9415213335792.

The previous prime is 10202121111191. The next prime is 10202121111229. The reversal of 10202121111221 is 12211112120201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202121111221 is a prime.

It is a super-2 number, since 2×10202121111221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10202121111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202121111229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88658141 + ... + 88773138.

It is an arithmetic number, because the mean of its divisors is an integer number (1373672969760).

Almost surely, 2^{10202121111221} is an apocalyptic number.

It is an amenable number.

10202121111221 is a deficient number, since it is larger than the sum of its proper divisors (787262646859).

10202121111221 is a wasteful number, since it uses less digits than its factorization.

10202121111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177435715.

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

Adding to 10202121111221 its reverse (12211112120201), we get a palindrome (22413233231422).

The spelling of 10202121111221 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".