21421430410 has 16 divisors (see below), whose sum is σ = 38574798336. Its totient is φ = 8564966928.

The previous prime is 21421430383. The next prime is 21421430417. The reversal of 21421430410 is 1403412412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21421430417) 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, 425634 + ... + 473293.

It is an arithmetic number, because the mean of its divisors is an integer number (2410924896).

Almost surely, 2^21421430410 is an apocalyptic number.

21421430410 is a deficient number, since it is larger than the sum of its proper divisors (17153367926).

21421430410 is a wasteful number, since it uses less digits than its factorization.

21421430410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901317.

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

Adding to 21421430410 its reverse (1403412412), we get a palindrome (22824842822).

The spelling of 21421430410 in words is "twenty-one billion, four hundred twenty-one million, four hundred thirty thousand, four hundred ten".