21420213330 has 64 divisors (see below), whose sum is σ = 52052969088. Its totient is φ = 5640821760.

The previous prime is 21420213289. The next prime is 21420213341. The reversal of 21420213330 is 3331202412.

It is a junction number, because it is equal to n+sod(n) for n = 21420213297 and 21420213306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 927625 + ... + 950435.

It is an arithmetic number, because the mean of its divisors is an integer number (813327642).

Almost surely, 2^21420213330 is an apocalyptic number.

21420213330 is an abundant number, since it is smaller than the sum of its proper divisors (30632755758).

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

21420213330 is a wasteful number, since it uses less digits than its factorization.

21420213330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23211.

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

Adding to 21420213330 its reverse (3331202412), we get a palindrome (24751415742).

The spelling of 21420213330 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, three hundred thirty".