63820421 has 8 divisors (see below), whose sum is σ = 73512960. Its totient is φ = 54271728.

The previous prime is 63820357. The next prime is 63820447. The reversal of 63820421 is 12402836.

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

It is not a de Polignac number, because 63820421 - 2⁶ = 63820357 is a prime.

It is a super-2 number, since 2×63820421² = 8146092273234482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63820451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35006 + ... + 36783.

It is an arithmetic number, because the mean of its divisors is an integer number (9189120).

Almost surely, 2^63820421 is an apocalyptic number.

It is an amenable number.

63820421 is a deficient number, since it is larger than the sum of its proper divisors (9692539).

63820421 is a wasteful number, since it uses less digits than its factorization.

63820421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71923.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 63820421 is about 7988.7684282372. The cubic root of 63820421 is about 399.6255266169.

The spelling of 63820421 in words is "sixty-three million, eight hundred twenty thousand, four hundred twenty-one".