21336964281 has 12 divisors (see below), whose sum is σ = 31882820580. Its totient is φ = 13734137760.

The previous prime is 21336964273. The next prime is 21336964289. The reversal of 21336964281 is 18246963312.

21336964281 is a `hidden beast` number, since 2 + 1 + 3 + 369 + 6 + 4 + 281 = 666.

It is an interprime number because it is at equal distance from previous prime (21336964273) and next prime (21336964289).

It can be written as a sum of positive squares in 2 ways, for example, as 4717629225 + 16619335056 = 68685^2 + 128916^2 .

It is not a de Polignac number, because 21336964281 - 2³ = 21336964273 is a prime.

It is a super-3 number, since 3×21336964281³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21336964289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40875150 + ... + 40875671.

It is an arithmetic number, because the mean of its divisors is an integer number (2656901715).

Almost surely, 2^21336964281 is an apocalyptic number.

It is an amenable number.

21336964281 is a deficient number, since it is larger than the sum of its proper divisors (10545856299).

21336964281 is a wasteful number, since it uses less digits than its factorization.

21336964281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81750856 (or 81750853 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 21336964281 in words is "twenty-one billion, three hundred thirty-six million, nine hundred sixty-four thousand, two hundred eighty-one".