101221281 has 48 divisors (see below), whose sum is σ = 183081600. Its totient is φ = 52545024.

The previous prime is 101221279. The next prime is 101221297. The reversal of 101221281 is 182122101.

It is not a de Polignac number, because 101221281 - 2¹ = 101221279 is a prime.

It is a super-2 number, since 2×101221281² = 20491495454561922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101221201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29430 + ... + 32688.

It is an arithmetic number, because the mean of its divisors is an integer number (3814200).

Almost surely, 2^101221281 is an apocalyptic number.

It is an amenable number.

101221281 is a deficient number, since it is larger than the sum of its proper divisors (81860319).

101221281 is a wasteful number, since it uses less digits than its factorization.

101221281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318 (or 3315 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 101221281 is about 10060.8787389571. The cubic root of 101221281 is about 466.0408042640.

Adding to 101221281 its reverse (182122101), we get a palindrome (283343382).

The spelling of 101221281 in words is "one hundred one million, two hundred twenty-one thousand, two hundred eighty-one".