10212221120021 has 8 divisors (see below), whose sum is σ = 10813029625944. Its totient is φ = 9611422571520.

The previous prime is 10212221119937. The next prime is 10212221120041. The reversal of 10212221120021 is 12002112221201.

It can be written as a sum of positive squares in 4 ways, for example, as 3155685780625 + 7056535339396 = 1776425^2 + 2656414^2 .

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-10212221120021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212221120041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324020 + ... + 4530941.

It is an arithmetic number, because the mean of its divisors is an integer number (1351628703243).

Almost surely, 2^{10212221120021} is an apocalyptic number.

It is an amenable number.

10212221120021 is a deficient number, since it is larger than the sum of its proper divisors (600808505923).

10212221120021 is a wasteful number, since it uses less digits than its factorization.

10212221120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978711.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10212221120021 its reverse (12002112221201), we get a palindrome (22214333341222).

The spelling of 10212221120021 in words is "ten trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".