101221505 has 72 divisors (see below), whose sum is σ = 163404864. Its totient is φ = 59505600.

The previous prime is 101221469. The next prime is 101221559. The reversal of 101221505 is 505122101.

It is not a de Polignac number, because 101221505 - 2¹⁰ = 101220481 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1425620 + ... + 1425690.

It is an arithmetic number, because the mean of its divisors is an integer number (2269512).

Almost surely, 2^101221505 is an apocalyptic number.

It is an amenable number.

101221505 is a deficient number, since it is larger than the sum of its proper divisors (62183359).

101221505 is a wasteful number, since it uses less digits than its factorization.

101221505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 101221505 is about 10060.8898711794. The cubic root of 101221505 is about 466.0411480424.

Adding to 101221505 its reverse (505122101), we get a palindrome (606343606).

The spelling of 101221505 in words is "one hundred one million, two hundred twenty-one thousand, five hundred five".