2721221221215 has 16 divisors (see below), whose sum is σ = 4975947376128. Its totient is φ = 1243986843936.

The previous prime is 2721221221211. The next prime is 2721221221217. The reversal of 2721221221215 is 5121221221272.

It is not a de Polignac number, because 2721221221215 - 2² = 2721221221211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721221221211) 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, 12958196187 + ... + 12958196396.

It is an arithmetic number, because the mean of its divisors is an integer number (310996711008).

Almost surely, 2^{2721221221215} is an apocalyptic number.

2721221221215 is a deficient number, since it is larger than the sum of its proper divisors (2254726154913).

2721221221215 is a wasteful number, since it uses less digits than its factorization.

2721221221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25916392598.

The product of its digits is 4480, while the sum is 30.

Adding to 2721221221215 its reverse (5121221221272), we get a palindrome (7842442442487).

The spelling of 2721221221215 in words is "two trillion, seven hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred fifteen".