21242342410 has 16 divisors (see below), whose sum is σ = 38242521576. Its totient is φ = 8495535808.

The previous prime is 21242342393. The next prime is 21242342417. The reversal of 21242342410 is 1424324212.

It can be written as a sum of positive squares in 4 ways, for example, as 13942177929 + 7300164481 = 118077^2 + 85441^2 .

It is a super-2 number, since 2×21242342410² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21242342417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110329 + ... + 233788.

Almost surely, 2^21242342410 is an apocalyptic number.

21242342410 is a deficient number, since it is larger than the sum of its proper divisors (17000179166).

21242342410 is a wasteful number, since it uses less digits than its factorization.

21242342410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350297.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21242342410 its reverse (1424324212), we get a palindrome (22666666622).

The spelling of 21242342410 in words is "twenty-one billion, two hundred forty-two million, three hundred forty-two thousand, four hundred ten".