101520221 has 4 divisors (see below), whose sum is σ = 110749344. Its totient is φ = 92291100.

The previous prime is 101520203. The next prime is 101520227. The reversal of 101520221 is 122025101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122025101 = 11 ⋅11093191.

It is not a de Polignac number, because 101520221 - 2⁶ = 101520157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101520196 and 101520205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101520227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4614545 + ... + 4614566.

It is an arithmetic number, because the mean of its divisors is an integer number (27687336).

Almost surely, 2^101520221 is an apocalyptic number.

101520221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101520221 is a deficient number, since it is larger than the sum of its proper divisors (9229123).

101520221 is an equidigital number, since it uses as much as digits as its factorization.

101520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229122.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 101520221 is about 10075.7243412074. The cubic root of 101520221 is about 466.4991443491.

Adding to 101520221 its reverse (122025101), we get a palindrome (223545322).

The spelling of 101520221 in words is "one hundred one million, five hundred twenty thousand, two hundred twenty-one".