221142015 has 16 divisors (see below), whose sum is σ = 393141600. Its totient is φ = 117942336.

The previous prime is 221142013. The next prime is 221142029. The reversal of 221142015 is 510241122.

It is not a de Polignac number, because 221142015 - 2¹ = 221142013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142011) 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, 818910 + ... + 819179.

It is an arithmetic number, because the mean of its divisors is an integer number (24571350).

Almost surely, 2^221142015 is an apocalyptic number.

221142015 is a deficient number, since it is larger than the sum of its proper divisors (171999585).

221142015 is a wasteful number, since it uses less digits than its factorization.

221142015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638103 (or 1638097 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221142015 is about 14870.8444615630. The cubic root of 221142015 is about 604.7238363478.

Adding to 221142015 its reverse (510241122), we get a palindrome (731383137).

The spelling of 221142015 in words is "two hundred twenty-one million, one hundred forty-two thousand, fifteen".