21003203123220 has 48 divisors (see below), whose sum is σ = 62268319850688. Its totient is φ = 5271392156160.

The previous prime is 21003203123197. The next prime is 21003203123333. The reversal of 21003203123220 is 2232130230012.

It is a happy number.

It is a super-2 number, since 2×21003203123220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10295686786 + ... + 10295688825.

It is an arithmetic number, because the mean of its divisors is an integer number (1297256663556).

Almost surely, 2^{21003203123220} is an apocalyptic number.

21003203123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003203123220 is an abundant number, since it is smaller than the sum of its proper divisors (41265116727468).

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

21003203123220 is a wasteful number, since it uses less digits than its factorization.

21003203123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20591375640 (or 20591375638 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21003203123220 its reverse (2232130230012), we get a palindrome (23235333353232).

The spelling of 21003203123220 in words is "twenty-one trillion, three billion, two hundred three million, one hundred twenty-three thousand, two hundred twenty".