10021221121221 has 32 divisors (see below), whose sum is σ = 14971009351680. Its totient is φ = 6624729196848.

The previous prime is 10021221121217. The next prime is 10021221121279. The reversal of 10021221121221 is 12212112212001.

10021221121221 is a `hidden beast` number, since 1 + 0 + 0 + 212 + 211 + 21 + 221 = 666.

It is not a de Polignac number, because 10021221121221 - 2² = 10021221121217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021221121194 and 10021221121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021221121211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5772850 + ... + 7305356.

It is an arithmetic number, because the mean of its divisors is an integer number (467844042240).

Almost surely, 2^{10021221121221} is an apocalyptic number.

It is an amenable number.

10021221121221 is a deficient number, since it is larger than the sum of its proper divisors (4949788230459).

10021221121221 is a wasteful number, since it uses less digits than its factorization.

10021221121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534550 (or 1534544 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 10021221121221 its reverse (12212112212001), we get a palindrome (22233333333222).

The spelling of 10021221121221 in words is "ten trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".