63854333021 has 16 divisors (see below), whose sum is σ = 65301316080. Its totient is φ = 62426972160.

The previous prime is 63854333017. The next prime is 63854333051. The reversal of 63854333021 is 12033345836.

It can be written as a sum of positive squares in 8 ways, for example, as 8720944996 + 55133388025 = 93386^2 + 234805^2 .

It is a cyclic number.

It is not a de Polignac number, because 63854333021 - 2² = 63854333017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63854333051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3554141 + ... + 3572061.

It is an arithmetic number, because the mean of its divisors is an integer number (4081332255).

Almost surely, 2^63854333021 is an apocalyptic number.

It is an amenable number.

63854333021 is a deficient number, since it is larger than the sum of its proper divisors (1446983059).

63854333021 is a wasteful number, since it uses less digits than its factorization.

63854333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18464.

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 63854333021 its reverse (12033345836), we get a palindrome (75887678857).

The spelling of 63854333021 in words is "sixty-three billion, eight hundred fifty-four million, three hundred thirty-three thousand, twenty-one".