21230203340 has 12 divisors (see below), whose sum is σ = 44583427056. Its totient is φ = 8492081328.

The previous prime is 21230203331. The next prime is 21230203367. The reversal of 21230203340 is 4330203212.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1061510167 = 21230203340 / (2 + 1 + 2 + 3 + 0 + 2 + 0 + 3 + 3 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530755064 + ... + 530755103.

It is an arithmetic number, because the mean of its divisors is an integer number (3715285588).

Almost surely, 2^21230203340 is an apocalyptic number.

21230203340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230203340 is an abundant number, since it is smaller than the sum of its proper divisors (23353223716).

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

21230203340 is a wasteful number, since it uses less digits than its factorization.

21230203340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061510176 (or 1061510174 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21230203340 its reverse (4330203212), we get a palindrome (25560406552).

The spelling of 21230203340 in words is "twenty-one billion, two hundred thirty million, two hundred three thousand, three hundred forty".