21340220320 has 24 divisors (see below), whose sum is σ = 50416270884. Its totient is φ = 8536088064.

The previous prime is 21340220303. The next prime is 21340220357. The reversal of 21340220320 is 2302204312.

It can be written as a sum of positive squares in 2 ways, for example, as 21328849936 + 11370384 = 146044^2 + 3372^2 .

It is a super-2 number, since 2×21340220320² (a number of 21 digits) contains 22 as substring.

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, 66688029 + ... + 66688348.

Almost surely, 2^21340220320 is an apocalyptic number.

21340220320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21340220320 is an abundant number, since it is smaller than the sum of its proper divisors (29076050564).

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

21340220320 is a wasteful number, since it uses less digits than its factorization.

21340220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133376392 (or 133376384 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21340220320 its reverse (2302204312), we get a palindrome (23642424632).

The spelling of 21340220320 in words is "twenty-one billion, three hundred forty million, two hundred twenty thousand, three hundred twenty".