10021000021221 has 32 divisors (see below), whose sum is σ = 15438647524608. Its totient is φ = 5663298493440.

The previous prime is 10021000021213. The next prime is 10021000021283. The reversal of 10021000021221 is 12212000012001.

It is not a de Polignac number, because 10021000021221 - 2³ = 10021000021213 is a prime.

It is a super-2 number, since 2×10021000021221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10021000021197 and 10021000021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021000021621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3486226 + ... + 5674131.

It is an arithmetic number, because the mean of its divisors is an integer number (482457735144).

Almost surely, 2^{10021000021221} is an apocalyptic number.

It is an amenable number.

10021000021221 is a deficient number, since it is larger than the sum of its proper divisors (5417647503387).

10021000021221 is a wasteful number, since it uses less digits than its factorization.

10021000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160941.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10021000021221 its reverse (12212000012001), we get a palindrome (22233000033222).

The spelling of 10021000021221 in words is "ten trillion, twenty-one billion, twenty-one thousand, two hundred twenty-one".