21021000210221 has 8 divisors (see below), whose sum is σ = 22935871987104. Its totient is φ = 19106773726320.

The previous prime is 21021000210167. The next prime is 21021000210233. The reversal of 21021000210221 is 12201200012012.

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 21021000210221 - 2²² = 21020996015917 is a prime.

It is a super-2 number, since 2×21021000210221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21021000210196 and 21021000210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021000210271) 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, 161255126 + ... + 161385431.

It is an arithmetic number, because the mean of its divisors is an integer number (2866983998388).

Almost surely, 2^{21021000210221} is an apocalyptic number.

It is an amenable number.

21021000210221 is a deficient number, since it is larger than the sum of its proper divisors (1914871776883).

21021000210221 is a wasteful number, since it uses less digits than its factorization.

21021000210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322646491.

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

Adding to 21021000210221 its reverse (12201200012012), we get a palindrome (33222200222233).

The spelling of 21021000210221 in words is "twenty-one trillion, twenty-one billion, two hundred ten thousand, two hundred twenty-one".