21021111200221 has 8 divisors (see below), whose sum is σ = 22942122261984. Its totient is φ = 19101766963920.

The previous prime is 21021111200087. The next prime is 21021111200251. The reversal of 21021111200221 is 12200211112012.

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 21021111200221 - 2⁹ = 21021111199709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021111200195 and 21021111200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021111200251) 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, 416679991 + ... + 416730436.

It is an arithmetic number, because the mean of its divisors is an integer number (2867765282748).

Almost surely, 2^{21021111200221} is an apocalyptic number.

It is an amenable number.

21021111200221 is a deficient number, since it is larger than the sum of its proper divisors (1921011061763).

21021111200221 is a wasteful number, since it uses less digits than its factorization.

21021111200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833412731.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021111200221 its reverse (12200211112012), we get a palindrome (33221322312233).

The spelling of 21021111200221 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred thousand, two hundred twenty-one".