21200221002021 has 8 divisors (see below), whose sum is σ = 28268740650624. Its totient is φ = 14132591010720.

The previous prime is 21200221002001. The next prime is 21200221002029. The reversal of 21200221002021 is 12020012200212.

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

It is not a de Polignac number, because 21200221002021 - 2⁵ = 21200221001989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221002029) 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 7 ways as a sum of consecutive naturals, for example, 222358720 + ... + 222454041.

It is an arithmetic number, because the mean of its divisors is an integer number (3533592581328).

Almost surely, 2^{21200221002021} is an apocalyptic number.

It is an amenable number.

21200221002021 is a deficient number, since it is larger than the sum of its proper divisors (7068519648603).

21200221002021 is a wasteful number, since it uses less digits than its factorization.

21200221002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444828651.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200221002021 its reverse (12020012200212), we get a palindrome (33220233202233).

The spelling of 21200221002021 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, two thousand, twenty-one".