21420210410 has 16 divisors (see below), whose sum is σ = 38644214400. Its totient is φ = 8548565136.

The previous prime is 21420210407. The next prime is 21420210433. The reversal of 21420210410 is 1401202412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2435270 + ... + 2444049.

It is an arithmetic number, because the mean of its divisors is an integer number (2415263400).

Almost surely, 2^21420210410 is an apocalyptic number.

21420210410 is a deficient number, since it is larger than the sum of its proper divisors (17224003990).

21420210410 is a wasteful number, since it uses less digits than its factorization.

21420210410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879765.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21420210410 its reverse (1401202412), we get a palindrome (22821412822).

The spelling of 21420210410 in words is "twenty-one billion, four hundred twenty million, two hundred ten thousand, four hundred ten".