21341203220 has 24 divisors (see below), whose sum is σ = 44889188904. Its totient is φ = 8522640896.

The previous prime is 21341203189. The next prime is 21341203243. The reversal of 21341203220 is 2230214312.

It can be written as a sum of positive squares in 4 ways, for example, as 2421136 + 21338782084 = 1556^2 + 146078^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21341203192 and 21341203201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 852377 + ... + 877056.

It is an arithmetic number, because the mean of its divisors is an integer number (1870382871).

Almost surely, 2^21341203220 is an apocalyptic number.

21341203220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21341203220 is an abundant number, since it is smaller than the sum of its proper divisors (23547985684).

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

21341203220 is a wasteful number, since it uses less digits than its factorization.

21341203220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730059 (or 1730057 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21341203220 its reverse (2230214312), we get a palindrome (23571417532).

The spelling of 21341203220 in words is "twenty-one billion, three hundred forty-one million, two hundred three thousand, two hundred twenty".