894781214721 has 24 divisors (see below), whose sum is σ = 1304832208680. Its totient is φ = 590838368256.

The previous prime is 894781214689. The next prime is 894781214749. The reversal of 894781214721 is 127412187498.

894781214721 is a `hidden beast` number, since 8 + 9 + 47 + 8 + 121 + 472 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 252771639696 + 642009575025 = 502764^2 + 801255^2 .

It is not a de Polignac number, because 894781214721 - 2⁵ = 894781214689 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (894781214021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 726966 + ... + 1522511.

It is an arithmetic number, because the mean of its divisors is an integer number (54368008695).

Almost surely, 2^894781214721 is an apocalyptic number.

It is an amenable number.

894781214721 is a deficient number, since it is larger than the sum of its proper divisors (410050993959).

894781214721 is a wasteful number, since it uses less digits than its factorization.

894781214721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249905 (or 2249902 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The spelling of 894781214721 in words is "eight hundred ninety-four billion, seven hundred eighty-one million, two hundred fourteen thousand, seven hundred twenty-one".