21030222121021 has 8 divisors (see below), whose sum is σ = 21519535752000. Its totient is φ = 20540919340032.

The previous prime is 21030222120967. The next prime is 21030222121049. The reversal of 21030222121021 is 12012122203012.

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

It is a cyclic number.

It is not a de Polignac number, because 21030222121021 - 2¹³ = 21030222112829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030222121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030222121081) 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, 1276605 + ... + 6609853.

It is an arithmetic number, because the mean of its divisors is an integer number (2689941969000).

Almost surely, 2^{21030222121021} is an apocalyptic number.

It is an amenable number.

21030222121021 is a deficient number, since it is larger than the sum of its proper divisors (489313630979).

21030222121021 is an equidigital number, since it uses as much as digits as its factorization.

21030222121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424995.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21030222121021 its reverse (12012122203012), we get a palindrome (33042344324033).

The spelling of 21030222121021 in words is "twenty-one trillion, thirty billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".