21003020012220 has 96 divisors (see below), whose sum is σ = 61367220794880. Its totient is φ = 5357128339200.

The previous prime is 21003020012173. The next prime is 21003020012239. The reversal of 21003020012220 is 2221002030012.

It is a happy number.

It is a super-2 number, since 2×21003020012220² (a number of 27 digits) contains 22 as substring.

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 21003020012220.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 48663370 + ... + 49093070.

It is an arithmetic number, because the mean of its divisors is an integer number (639241883280).

Almost surely, 2^{21003020012220} is an apocalyptic number.

21003020012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003020012220 is an abundant number, since it is smaller than the sum of its proper divisors (40364200782660).

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

21003020012220 is a wasteful number, since it uses less digits than its factorization.

21003020012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465155 (or 465153 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21003020012220 its reverse (2221002030012), we get a palindrome (23224022042232).

The spelling of 21003020012220 in words is "twenty-one trillion, three billion, twenty million, twelve thousand, two hundred twenty".