63221473 has 4 divisors (see below), whose sum is σ = 72253120. Its totient is φ = 54189828.

The previous prime is 63221461. The next prime is 63221497. The reversal of 63221473 is 37412236.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63221473 - 2²⁵ = 29667041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63221423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4515813 + ... + 4515826.

It is an arithmetic number, because the mean of its divisors is an integer number (18063280).

Almost surely, 2^63221473 is an apocalyptic number.

It is an amenable number.

63221473 is a deficient number, since it is larger than the sum of its proper divisors (9031647).

63221473 is an equidigital number, since it uses as much as digits as its factorization.

63221473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9031646.

The product of its digits is 6048, while the sum is 28.

The square root of 63221473 is about 7951.1931809006. The cubic root of 63221473 is about 398.3714472885.

The spelling of 63221473 in words is "sixty-three million, two hundred twenty-one thousand, four hundred seventy-three".