21236242416 has 20 divisors (see below), whose sum is σ = 54860293032. Its totient is φ = 7078747456.

The previous prime is 21236242397. The next prime is 21236242439. The reversal of 21236242416 is 61424263212.

It is a super-2 number, since 2×21236242416² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221210811 + ... + 221210906.

Almost surely, 2^21236242416 is an apocalyptic number.

It is an amenable number.

21236242416 is an abundant number, since it is smaller than the sum of its proper divisors (33624050616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21236242416 is a wasteful number, since it uses less digits than its factorization.

21236242416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442421728 (or 442421722 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The spelling of 21236242416 in words is "twenty-one billion, two hundred thirty-six million, two hundred forty-two thousand, four hundred sixteen".