21000221201021 has 8 divisors (see below), whose sum is σ = 21456752256000. Its totient is φ = 20544095056048.

The previous prime is 21000221200997. The next prime is 21000221201207. The reversal of 21000221201021 is 12010212200012.

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 21000221201021 - 2²⁶ = 21000154092157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000221200987 and 21000221201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221201821) 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, 101122646 + ... + 101330103.

It is an arithmetic number, because the mean of its divisors is an integer number (2682094032000).

Almost surely, 2^{21000221201021} is an apocalyptic number.

It is an amenable number.

21000221201021 is a deficient number, since it is larger than the sum of its proper divisors (456531054979).

21000221201021 is a wasteful number, since it uses less digits than its factorization.

21000221201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202455003.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000221201021 its reverse (12010212200012), we get a palindrome (33010433401033).

The spelling of 21000221201021 in words is "twenty-one trillion, two hundred twenty-one million, two hundred one thousand, twenty-one".