21210122010020 has 48 divisors (see below), whose sum is σ = 44987920710768. Its totient is φ = 8398991001600.

The previous prime is 21210122010019. The next prime is 21210122010029. The reversal of 21210122010020 is 2001022101212.

It can be written as a sum of positive squares in 8 ways, for example, as 635170744576 + 20574951265444 = 796976^2 + 4535962^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210122009977 and 21210122010004.

It is not an unprimeable number, because it can be changed into a prime (21210122010029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15489032 + ... + 16802688.

It is an arithmetic number, because the mean of its divisors is an integer number (937248348141).

Almost surely, 2^{21210122010020} is an apocalyptic number.

21210122010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210122010020 is an abundant number, since it is smaller than the sum of its proper divisors (23777798700748).

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

21210122010020 is a wasteful number, since it uses less digits than its factorization.

21210122010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321760 (or 1321758 counting only the distinct ones).

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

Adding to 21210122010020 its reverse (2001022101212), we get a palindrome (23211144111232).

The spelling of 21210122010020 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, ten thousand, twenty".