21021201210320 has 20 divisors (see below), whose sum is σ = 48874292814180. Its totient is φ = 8408480484096.

The previous prime is 21021201210239. The next prime is 21021201210323. The reversal of 21021201210320 is 2301210212012.

It can be written as a sum of positive squares in 2 ways, for example, as 15582566770576 + 5438634439744 = 3947476^2 + 2332088^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021201210323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131382507485 + ... + 131382507644.

It is an arithmetic number, because the mean of its divisors is an integer number (2443714640709).

Almost surely, 2^{21021201210320} is an apocalyptic number.

21021201210320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021201210320 is an abundant number, since it is smaller than the sum of its proper divisors (27853091603860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021201210320 is a wasteful number, since it uses less digits than its factorization.

21021201210320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262765015142 (or 262765015136 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21021201210320 its reverse (2301210212012), we get a palindrome (23322411422332).

The spelling of 21021201210320 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred ten thousand, three hundred twenty".