21210301221020 has 24 divisors (see below), whose sum is σ = 44767732230144. Its totient is φ = 8441053885376.

The previous prime is 21210301221013. The next prime is 21210301221023. The reversal of 21210301221020 is 2012210301212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210301221020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210301221023) 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, 2691658652 + ... + 2691666531.

It is an arithmetic number, because the mean of its divisors is an integer number (1865322176256).

Almost surely, 2^{21210301221020} is an apocalyptic number.

21210301221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210301221020 is an abundant number, since it is smaller than the sum of its proper divisors (23557431009124).

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

21210301221020 is a wasteful number, since it uses less digits than its factorization.

21210301221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383325389 (or 5383325387 counting only the distinct ones).

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

Adding to 21210301221020 its reverse (2012210301212), we get a palindrome (23222511522232).

The spelling of 21210301221020 in words is "twenty-one trillion, two hundred ten billion, three hundred one million, two hundred twenty-one thousand, twenty".