21420431410 has 16 divisors (see below), whose sum is σ = 44064887616. Its totient is φ = 7344147888.

The previous prime is 21420431401. The next prime is 21420431411. The reversal of 21420431410 is 1413402412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21420431411) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 153003012 + ... + 153003151.

It is an arithmetic number, because the mean of its divisors is an integer number (2754055476).

Almost surely, 2^21420431410 is an apocalyptic number.

21420431410 is an abundant number, since it is smaller than the sum of its proper divisors (22644456206).

21420431410 is a wasteful number, since it uses less digits than its factorization.

21420431410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306006177.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21420431410 its reverse (1413402412), we get a palindrome (22833833822).

The spelling of 21420431410 in words is "twenty-one billion, four hundred twenty million, four hundred thirty-one thousand, four hundred ten".