15361221 has 8 divisors (see below), whose sum is σ = 20535840. Its totient is φ = 10213712.

The previous prime is 15361219. The next prime is 15361231. The reversal of 15361221 is 12216351.

15361221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15361221 - 2¹ = 15361219 is a prime.

It is a super-2 number, since 2×15361221² = 471934221221682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15361201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5415 + ... + 7748.

It is an arithmetic number, because the mean of its divisors is an integer number (2566980).

Almost surely, 2^15361221 is an apocalyptic number.

It is an amenable number.

15361221 is a deficient number, since it is larger than the sum of its proper divisors (5174619).

15361221 is a wasteful number, since it uses less digits than its factorization.

15361221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555.

The product of its digits is 360, while the sum is 21.

The square root of 15361221 is about 3919.3393575959. The cubic root of 15361221 is about 248.5851869874.

Adding to 15361221 its reverse (12216351), we get a palindrome (27577572).

The spelling of 15361221 in words is "fifteen million, three hundred sixty-one thousand, two hundred twenty-one".