15220022401 has 4 divisors (see below), whose sum is σ = 15224304852. Its totient is φ = 15215739952.

The previous prime is 15220022393. The next prime is 15220022407. The reversal of 15220022401 is 10422002251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10422002251 = 31 ⋅336193621.

It can be written as a sum of positive squares in 2 ways, for example, as 2460060801 + 12759961600 = 49599^2 + 112960^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220022401 - 2³ = 15220022393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15220022407) 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, 2135890 + ... + 2143003.

It is an arithmetic number, because the mean of its divisors is an integer number (3806076213).

Almost surely, 2^15220022401 is an apocalyptic number.

It is an amenable number.

15220022401 is a deficient number, since it is larger than the sum of its proper divisors (4282451).

15220022401 is an equidigital number, since it uses as much as digits as its factorization.

15220022401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282450.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 15220022401 its reverse (10422002251), we get a palindrome (25642024652).

The spelling of 15220022401 in words is "fifteen billion, two hundred twenty million, twenty-two thousand, four hundred one".