21354671063257 has 8 divisors (see below), whose sum is σ = 24405366909056. Its totient is φ = 18303982355232.

The previous prime is 21354671063111. The next prime is 21354671063269. The reversal of 21354671063257 is 75236017645312.

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

It is a de Polignac number, because none of the positive numbers 2^k-21354671063257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21354671063287) 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 7 ways as a sum of consecutive naturals, for example, 8857933 + ... + 11007829.

It is an arithmetic number, because the mean of its divisors is an integer number (3050670863632).

Almost surely, 2^{21354671063257} is an apocalyptic number.

It is an amenable number.

21354671063257 is a deficient number, since it is larger than the sum of its proper divisors (3050695845799).

21354671063257 is a wasteful number, since it uses less digits than its factorization.

21354671063257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3568887.

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 21354671063257 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred seventy-one million, sixty-three thousand, two hundred fifty-seven".