15461012221 has 4 divisors (see below), whose sum is σ = 15597835452. Its totient is φ = 15324188992.

The previous prime is 15461012207. The next prime is 15461012233. The reversal of 15461012221 is 12221016451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 743925625 + 14717086596 = 27275^2 + 121314^2 .

It is a cyclic number.

It is not a de Polignac number, because 15461012221 - 2¹³ = 15461004029 is a prime.

It is a super-2 number, since 2×15461012221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15461012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68411446 + ... + 68411671.

It is an arithmetic number, because the mean of its divisors is an integer number (3899458863).

Almost surely, 2^15461012221 is an apocalyptic number.

It is an amenable number.

15461012221 is a deficient number, since it is larger than the sum of its proper divisors (136823231).

15461012221 is a wasteful number, since it uses less digits than its factorization.

15461012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136823230.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 15461012221 its reverse (12221016451), we get a palindrome (27682028672).

The spelling of 15461012221 in words is "fifteen billion, four hundred sixty-one million, twelve thousand, two hundred twenty-one".