15221201661512 has 32 divisors (see below), whose sum is σ = 35582029859520. Its totient is φ = 5930338309440.

The previous prime is 15221201661469. The next prime is 15221201661521. The reversal of 15221201661512 is 21516610212251.

It is a super-2 number, since 2×15221201661512² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12354870863 + ... + 12354872094.

It is an arithmetic number, because the mean of its divisors is an integer number (1111938433110).

Almost surely, 2^{15221201661512} is an apocalyptic number.

It is an amenable number.

15221201661512 is an abundant number, since it is smaller than the sum of its proper divisors (20360828198008).

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

15221201661512 is a wasteful number, since it uses less digits than its factorization.

15221201661512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24709742981 (or 24709742977 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

Adding to 15221201661512 its reverse (21516610212251), we get a palindrome (36737811873763).

The spelling of 15221201661512 in words is "fifteen trillion, two hundred twenty-one billion, two hundred one million, six hundred sixty-one thousand, five hundred twelve".