15221121342 has 32 divisors (see below), whose sum is σ = 35639702784. Its totient is φ = 4242820800.

The previous prime is 15221121317. The next prime is 15221121371. The reversal of 15221121342 is 24312112251.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4417884 + ... + 4421327.

It is an arithmetic number, because the mean of its divisors is an integer number (1113740712).

Almost surely, 2^15221121342 is an apocalyptic number.

15221121342 is an abundant number, since it is smaller than the sum of its proper divisors (20418581442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15221121342 is a wasteful number, since it uses less digits than its factorization.

15221121342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8839264.

The product of its digits is 960, while the sum is 24.

Adding to 15221121342 its reverse (24312112251), we get a palindrome (39533233593).

Subtracting 15221121342 from its reverse (24312112251), we obtain a palindrome (9090990909).

The spelling of 15221121342 in words is "fifteen billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred forty-two".