4198357185921 has 24 divisors (see below), whose sum is σ = 6315914614464. Its totient is φ = 2684902943520.

The previous prime is 4198357185899. The next prime is 4198357185941. The reversal of 4198357185921 is 1295817538914.

4198357185921 is a `hidden beast` number, since 4 + 1 + 9 + 8 + 3 + 571 + 8 + 59 + 2 + 1 = 666.

It is not a de Polignac number, because 4198357185921 - 2⁷ = 4198357185793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4198357185941) 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 23 ways as a sum of consecutive naturals, for example, 88762831 + ... + 88810116.

It is an arithmetic number, because the mean of its divisors is an integer number (263163108936).

Almost surely, 2^{4198357185921} is an apocalyptic number.

It is an amenable number.

4198357185921 is a deficient number, since it is larger than the sum of its proper divisors (2117557428543).

4198357185921 is a wasteful number, since it uses less digits than its factorization.

4198357185921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177573061 (or 177573058 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 63.

The spelling of 4198357185921 in words is "four trillion, one hundred ninety-eight billion, three hundred fifty-seven million, one hundred eighty-five thousand, nine hundred twenty-one".