21162735243 has 64 divisors (see below), whose sum is σ = 35797507200. Its totient is φ = 12240875520.

The previous prime is 21162735241. The next prime is 21162735263. The reversal of 21162735243 is 34253726112.

21162735243 is a `hidden beast` number, since 2 + 1 + 1 + 62 + 73 + 524 + 3 = 666.

It is not a de Polignac number, because 21162735243 - 2¹ = 21162735241 is a prime.

It is a super-2 number, since 2×21162735243² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21162735198 and 21162735207.

It is not an unprimeable number, because it can be changed into a prime (21162735241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5613063 + ... + 5616831.

It is an arithmetic number, because the mean of its divisors is an integer number (559336050).

Almost surely, 2^21162735243 is an apocalyptic number.

21162735243 is a deficient number, since it is larger than the sum of its proper divisors (14634771957).

21162735243 is a wasteful number, since it uses less digits than its factorization.

21162735243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749 (or 4743 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The spelling of 21162735243 in words is "twenty-one billion, one hundred sixty-two million, seven hundred thirty-five thousand, two hundred forty-three".