15450055221 has 4 divisors (see below), whose sum is σ = 20600073632. Its totient is φ = 10300036812.

The previous prime is 15450055217. The next prime is 15450055223. The reversal of 15450055221 is 12255005451.

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 15450055221 - 2² = 15450055217 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 (15450055223) 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, 2575009201 + ... + 2575009206.

It is an arithmetic number, because the mean of its divisors is an integer number (5150018408).

Almost surely, 2^15450055221 is an apocalyptic number.

It is an amenable number.

15450055221 is a deficient number, since it is larger than the sum of its proper divisors (5150018411).

15450055221 is an equidigital number, since it uses as much as digits as its factorization.

15450055221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150018410.

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 15450055221 in words is "fifteen billion, four hundred fifty million, fifty-five thousand, two hundred twenty-one".