863676021 has 24 divisors (see below), whose sum is σ = 1264579776. Its totient is φ = 523985280.

The previous prime is 863675987. The next prime is 863676049. The reversal of 863676021 is 120676368.

It is not a de Polignac number, because 863676021 - 2⁹ = 863675509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863676061) 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, 24001 + ... + 47993.

It is an arithmetic number, because the mean of its divisors is an integer number (52690824).

Almost surely, 2^863676021 is an apocalyptic number.

It is an amenable number.

863676021 is a deficient number, since it is larger than the sum of its proper divisors (400903755).

863676021 is a wasteful number, since it uses less digits than its factorization.

863676021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24093 (or 24080 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 863676021 is about 29388.3654019750. The cubic root of 863676021 is about 952.3215689355.

The spelling of 863676021 in words is "eight hundred sixty-three million, six hundred seventy-six thousand, twenty-one".