101511221 has 16 divisors (see below), whose sum is σ = 117742464. Its totient is φ = 85722624.

The previous prime is 101511217. The next prime is 101511247. The reversal of 101511221 is 122115101.

It is a cyclic number.

It is not a de Polignac number, because 101511221 - 2² = 101511217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101511196 and 101511205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101511721) 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, 234221 + ... + 234653.

It is an arithmetic number, because the mean of its divisors is an integer number (7358904).

Almost surely, 2^101511221 is an apocalyptic number.

It is an amenable number.

101511221 is a deficient number, since it is larger than the sum of its proper divisors (16231243).

101511221 is a wasteful number, since it uses less digits than its factorization.

101511221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 101511221 is about 10075.2777132941. The cubic root of 101511221 is about 466.4853585360.

Adding to 101511221 its reverse (122115101), we get a palindrome (223626322).

The spelling of 101511221 in words is "one hundred one million, five hundred eleven thousand, two hundred twenty-one".