21515445344130 has 32 divisors (see below), whose sum is σ = 51638680920384. Its totient is φ = 5737272970176.

The previous prime is 21515445344117. The next prime is 21515445344137. The reversal of 21515445344130 is 3144354451512.

It is not an unprimeable number, because it can be changed into a prime (21515445344137) 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, 10216752 + ... + 12141371.

It is an arithmetic number, because the mean of its divisors is an integer number (1613708778762).

Almost surely, 2^{21515445344130} is an apocalyptic number.

21515445344130 is an abundant number, since it is smaller than the sum of its proper divisors (30123235576254).

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

21515445344130 is a wasteful number, since it uses less digits than its factorization.

21515445344130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22390210.

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21515445344130 its reverse (3144354451512), we get a palindrome (24659799795642).

The spelling of 21515445344130 in words is "twenty-one trillion, five hundred fifteen billion, four hundred forty-five million, three hundred forty-four thousand, one hundred thirty".