21021030101220 has 24 divisors (see below), whose sum is σ = 58858884283584. Its totient is φ = 5605608026976.

The previous prime is 21021030101219. The next prime is 21021030101257. The reversal of 21021030101220 is 2210103012012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21021030101220.

It is an unprimeable number.

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, 175175250784 + ... + 175175250903.

It is an arithmetic number, because the mean of its divisors is an integer number (2452453511816).

Almost surely, 2^{21021030101220} is an apocalyptic number.

21021030101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021030101220 is an abundant number, since it is smaller than the sum of its proper divisors (37837854182364).

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

21021030101220 is a wasteful number, since it uses less digits than its factorization.

21021030101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350350501699 (or 350350501697 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21021030101220 its reverse (2210103012012), we get a palindrome (23231133113232).

The spelling of 21021030101220 in words is "twenty-one trillion, twenty-one billion, thirty million, one hundred one thousand, two hundred twenty".