15542021220 has 48 divisors (see below), whose sum is σ = 47473812288. Its totient is φ = 3767762560.

The previous prime is 15542021207. The next prime is 15542021227. The reversal of 15542021220 is 2212024551.

It is not an unprimeable number, because it can be changed into a prime (15542021227) 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, 11773599 + ... + 11774918.

It is an arithmetic number, because the mean of its divisors is an integer number (989037756).

Almost surely, 2^15542021220 is an apocalyptic number.

15542021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15542021220 is an abundant number, since it is smaller than the sum of its proper divisors (31931791068).

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

15542021220 is a wasteful number, since it uses less digits than its factorization.

15542021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23548540 (or 23548538 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 15542021220 its reverse (2212024551), we get a palindrome (17754045771).

The spelling of 15542021220 in words is "fifteen billion, five hundred forty-two million, twenty-one thousand, two hundred twenty".