21420201320 has 64 divisors (see below), whose sum is σ = 56569207680. Its totient is φ = 7145577216.

The previous prime is 21420201289. The next prime is 21420201329. The reversal of 21420201320 is 2310202412.

It is not an unprimeable number, because it can be changed into a prime (21420201329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023434 + ... + 1044153.

It is an arithmetic number, because the mean of its divisors is an integer number (883893870).

Almost surely, 2^21420201320 is an apocalyptic number.

21420201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420201320 is an abundant number, since it is smaller than the sum of its proper divisors (35149006360).

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

21420201320 is a wasteful number, since it uses less digits than its factorization.

21420201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067642 (or 2067638 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21420201320 its reverse (2310202412), we get a palindrome (23730403732).

The spelling of 21420201320 in words is "twenty-one billion, four hundred twenty million, two hundred one thousand, three hundred twenty".