21420310330 has 32 divisors (see below), whose sum is σ = 38701805184. Its totient is φ = 8535911616.

The previous prime is 21420310319. The next prime is 21420310399. The reversal of 21420310330 is 3301302412.

It is a junction number, because it is equal to n+sod(n) for n = 21420310298 and 21420310307.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3079917 + ... + 3086863.

It is an arithmetic number, because the mean of its divisors is an integer number (1209431412).

Almost surely, 2^21420310330 is an apocalyptic number.

21420310330 is a deficient number, since it is larger than the sum of its proper divisors (17281494854).

21420310330 is a wasteful number, since it uses less digits than its factorization.

21420310330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21420310330 its reverse (3301302412), we get a palindrome (24721612742).

The spelling of 21420310330 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, three hundred thirty".