15242220421 has 16 divisors (see below), whose sum is σ = 15859065600. Its totient is φ = 14641256448.

The previous prime is 15242220397. The next prime is 15242220437. The reversal of 15242220421 is 12402224251.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 15242220421 - 2⁷ = 15242220293 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 (15242220481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435261 + ... + 468973.

It is an arithmetic number, because the mean of its divisors is an integer number (991191600).

Almost surely, 2^15242220421 is an apocalyptic number.

It is an amenable number.

15242220421 is a deficient number, since it is larger than the sum of its proper divisors (616845179).

15242220421 is an equidigital number, since it uses as much as digits as its factorization.

15242220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33948.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 15242220421 its reverse (12402224251), we get a palindrome (27644444672).

The spelling of 15242220421 in words is "fifteen billion, two hundred forty-two million, two hundred twenty thousand, four hundred twenty-one".