21246266345 has 8 divisors (see below), whose sum is σ = 25499376960. Its totient is φ = 16994441520.

The previous prime is 21246266333. The next prime is 21246266369. The reversal of 21246266345 is 54366264212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21246266345 - 2¹² = 21246262249 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 284711 + ... + 351500.

It is an arithmetic number, because the mean of its divisors is an integer number (3187422120).

Almost surely, 2^21246266345 is an apocalyptic number.

It is an amenable number.

21246266345 is a deficient number, since it is larger than the sum of its proper divisors (4253110615).

21246266345 is an equidigital number, since it uses as much as digits as its factorization.

21246266345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642895.

The product of its digits is 414720, while the sum is 41.

The spelling of 21246266345 in words is "twenty-one billion, two hundred forty-six million, two hundred sixty-six thousand, three hundred forty-five".