101551544221 has 4 divisors (see below), whose sum is σ = 101918156572. Its totient is φ = 101184931872.

The previous prime is 101551544203. The next prime is 101551544231. The reversal of 101551544221 is 122445155101.

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 8596071225 + 92955472996 = 92715^2 + 304886^2 .

It is a cyclic number.

It is not a de Polignac number, because 101551544221 - 2¹⁷ = 101551413149 is a prime.

It is a super-2 number, since 2×101551544221² (a number of 23 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 (101551544231) 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, 183305760 + ... + 183306313.

It is an arithmetic number, because the mean of its divisors is an integer number (25479539143).

Almost surely, 2^101551544221 is an apocalyptic number.

It is an amenable number.

101551544221 is a deficient number, since it is larger than the sum of its proper divisors (366612351).

101551544221 is an equidigital number, since it uses as much as digits as its factorization.

101551544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366612350.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 101551544221 its reverse (122445155101), we get a palindrome (223996699322).

The spelling of 101551544221 in words is "one hundred one billion, five hundred fifty-one million, five hundred forty-four thousand, two hundred twenty-one".