21234736737 has 64 divisors (see below), whose sum is σ = 35332070400. Its totient is φ = 12525477120.

The previous prime is 21234736631. The next prime is 21234736751. The reversal of 21234736737 is 73763743212.

21234736737 is a `hidden beast` number, since 21 + 234 + 7 + 367 + 37 = 666.

It is not a de Polignac number, because 21234736737 - 2¹⁰ = 21234735713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21234736692 and 21234736701.

It is not an unprimeable number, because it can be changed into a prime (21234736777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1133158 + ... + 1151744.

It is an arithmetic number, because the mean of its divisors is an integer number (552063600).

Almost surely, 2^21234736737 is an apocalyptic number.

21234736737 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21234736737 is a deficient number, since it is larger than the sum of its proper divisors (14097333663).

21234736737 is a wasteful number, since it uses less digits than its factorization.

21234736737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18763 (or 18757 counting only the distinct ones).

The product of its digits is 889056, while the sum is 45.

The spelling of 21234736737 in words is "twenty-one billion, two hundred thirty-four million, seven hundred thirty-six thousand, seven hundred thirty-seven".