21246435418 has 16 divisors (see below), whose sum is σ = 34328125440. Its totient is φ = 9804058416.

The previous prime is 21246435337. The next prime is 21246435433. The reversal of 21246435418 is 81453464212.

It is a happy number.

It is a super-2 number, since 2×21246435418² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51943 + ... + 212581.

It is an arithmetic number, because the mean of its divisors is an integer number (2145507840).

Almost surely, 2^21246435418 is an apocalyptic number.

21246435418 is a deficient number, since it is larger than the sum of its proper divisors (13081690022).

21246435418 is a wasteful number, since it uses less digits than its factorization.

21246435418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165741.

The product of its digits is 184320, while the sum is 40.

The spelling of 21246435418 in words is "twenty-one billion, two hundred forty-six million, four hundred thirty-five thousand, four hundred eighteen".