21423424010 has 16 divisors (see below), whose sum is σ = 38807784936. Its totient is φ = 8514787008.

The previous prime is 21423423971. The next prime is 21423424013. The reversal of 21423424010 is 1042432412.

It can be written as a sum of positive squares in 4 ways, for example, as 13437678241 + 7985745769 = 115921^2 + 89363^2 .

It is not an unprimeable number, because it can be changed into a prime (21423424013) 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, 6821177 + ... + 6824316.

Almost surely, 2^21423424010 is an apocalyptic number.

21423424010 is a deficient number, since it is larger than the sum of its proper divisors (17384360926).

21423424010 is a wasteful number, since it uses less digits than its factorization.

21423424010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13645657.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21423424010 its reverse (1042432412), we get a palindrome (22465856422).

The spelling of 21423424010 in words is "twenty-one billion, four hundred twenty-three million, four hundred twenty-four thousand, ten".