15221463 has 4 divisors (see below), whose sum is σ = 20295288. Its totient is φ = 10147640.

The previous prime is 15221431. The next prime is 15221501. The reversal of 15221463 is 36412251.

15221463 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15221463 - 2⁵ = 15221431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221263) 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, 2536908 + ... + 2536913.

It is an arithmetic number, because the mean of its divisors is an integer number (5073822).

Almost surely, 2^15221463 is an apocalyptic number.

15221463 is a deficient number, since it is larger than the sum of its proper divisors (5073825).

15221463 is an equidigital number, since it uses as much as digits as its factorization.

15221463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073824.

The product of its digits is 1440, while the sum is 24.

The square root of 15221463 is about 3901.4693385954. The cubic root of 15221463 is about 247.8290043510.

The spelling of 15221463 in words is "fifteen million, two hundred twenty-one thousand, four hundred sixty-three".