21210011020221 has 8 divisors (see below), whose sum is σ = 28294204372800. Its totient is φ = 14132912507232.

The previous prime is 21210011020201. The next prime is 21210011020229. The reversal of 21210011020221 is 12202011001212.

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

It is not a de Polignac number, because 21210011020221 - 2¹⁵ = 21210010987453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210011020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210011020229) 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, 1773702921 + ... + 1773714878.

It is an arithmetic number, because the mean of its divisors is an integer number (3536775546600).

Almost surely, 2^{21210011020221} is an apocalyptic number.

It is an amenable number.

21210011020221 is a deficient number, since it is larger than the sum of its proper divisors (7084193352579).

21210011020221 is a wasteful number, since it uses less digits than its factorization.

21210011020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547419795.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210011020221 its reverse (12202011001212), we get a palindrome (33412022021433).

The spelling of 21210011020221 in words is "twenty-one trillion, two hundred ten billion, eleven million, twenty thousand, two hundred twenty-one".