21043457733 has 16 divisors (see below), whose sum is σ = 29557483200. Its totient is φ = 13280342400.

The previous prime is 21043457707. The next prime is 21043457749. The reversal of 21043457733 is 33775434012.

It is not a de Polignac number, because 21043457733 - 2²² = 21039263429 is a prime.

It is a super-2 number, since 2×21043457733² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21043457691 and 21043457700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043457783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67728 + ... + 216041.

It is an arithmetic number, because the mean of its divisors is an integer number (1847342700).

Almost surely, 2^21043457733 is an apocalyptic number.

It is an amenable number.

21043457733 is a deficient number, since it is larger than the sum of its proper divisors (8514025467).

21043457733 is a wasteful number, since it uses less digits than its factorization.

21043457733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285092.

The product of its (nonzero) digits is 211680, while the sum is 39.

The spelling of 21043457733 in words is "twenty-one billion, forty-three million, four hundred fifty-seven thousand, seven hundred thirty-three".