21154276337 has 4 divisors (see below), whose sum is σ = 21154996596. Its totient is φ = 21153556080.

The previous prime is 21154276309. The next prime is 21154276387. The reversal of 21154276337 is 73367245112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6655949056 + 14498327281 = 81584^2 + 120409^2 .

It is a cyclic number.

It is not a de Polignac number, because 21154276337 - 2¹⁴ = 21154259953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21154276294 and 21154276303.

It is not an unprimeable number, because it can be changed into a prime (21154276307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314114 + ... + 375467.

It is an arithmetic number, because the mean of its divisors is an integer number (5288749149).

Almost surely, 2^21154276337 is an apocalyptic number.

It is an amenable number.

21154276337 is a deficient number, since it is larger than the sum of its proper divisors (720259).

21154276337 is an equidigital number, since it uses as much as digits as its factorization.

21154276337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720258.

The product of its digits is 211680, while the sum is 41.

The spelling of 21154276337 in words is "twenty-one billion, one hundred fifty-four million, two hundred seventy-six thousand, three hundred thirty-seven".