10015115221 has 4 divisors (see below), whose sum is σ = 10017366732. Its totient is φ = 10012863712.

The previous prime is 10015115189. The next prime is 10015115249. The reversal of 10015115221 is 12251151001.

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 3178140625 + 6836974596 = 56375^2 + 82686^2 .

It is a cyclic number.

It is not a de Polignac number, because 10015115221 - 2⁵ = 10015115189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10015113221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119070 + ... + 1127983.

It is an arithmetic number, because the mean of its divisors is an integer number (2504341683).

Almost surely, 2^10015115221 is an apocalyptic number.

It is an amenable number.

10015115221 is a deficient number, since it is larger than the sum of its proper divisors (2251511).

10015115221 is an equidigital number, since it uses as much as digits as its factorization.

10015115221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251510.

The product of its (nonzero) digits is 100, while the sum is 19.

Adding to 10015115221 its reverse (12251151001), we get a palindrome (22266266222).

The spelling of 10015115221 in words is "ten billion, fifteen million, one hundred fifteen thousand, two hundred twenty-one".