21420140410 has 8 divisors (see below), whose sum is σ = 38556252756. Its totient is φ = 8568056160.

The previous prime is 21420140387. The next prime is 21420140411. The reversal of 21420140410 is 1404102412.

It can be written as a sum of positive squares in 2 ways, for example, as 21330894601 + 89245809 = 146051^2 + 9447^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21420140410² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21420140411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071007011 + ... + 1071007030.

Almost surely, 2^21420140410 is an apocalyptic number.

21420140410 is a deficient number, since it is larger than the sum of its proper divisors (17136112346).

21420140410 is a wasteful number, since it uses less digits than its factorization.

21420140410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142014048.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21420140410 its reverse (1404102412), we get a palindrome (22824242822).

The spelling of 21420140410 in words is "twenty-one billion, four hundred twenty million, one hundred forty thousand, four hundred ten".