21235401330 has 64 divisors (see below), whose sum is σ = 59874933888. Its totient is φ = 4751976960.

The previous prime is 21235401329. The next prime is 21235401367. The reversal of 21235401330 is 3310453212.

It is a self number, because there is not a number n which added to its sum of digits gives 21235401330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2470699 + ... + 2479278.

It is an arithmetic number, because the mean of its divisors is an integer number (935545842).

Almost surely, 2^21235401330 is an apocalyptic number.

21235401330 is an abundant number, since it is smaller than the sum of its proper divisors (38639532558).

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

21235401330 is a wasteful number, since it uses less digits than its factorization.

21235401330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950011.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21235401330 its reverse (3310453212), we get a palindrome (24545854542).

The spelling of 21235401330 in words is "twenty-one billion, two hundred thirty-five million, four hundred one thousand, three hundred thirty".