101222720 has 28 divisors (see below), whose sum is σ = 241037364. Its totient is φ = 40488960.

The previous prime is 101222711. The next prime is 101222773. The reversal of 101222720 is 27222101.

It can be written as a sum of positive squares in 2 ways, for example, as 74926336 + 26296384 = 8656^2 + 5128^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 157841 + ... + 158480.

Almost surely, 2^101222720 is an apocalyptic number.

101222720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101222720 is an abundant number, since it is smaller than the sum of its proper divisors (139814644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101222720 is an equidigital number, since it uses as much as digits as its factorization.

101222720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316338 (or 316328 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 101222720 is about 10060.9502533309. The cubic root of 101222720 is about 466.0430127243.

Adding to 101222720 its reverse (27222101), we get a palindrome (128444821).

It can be divided in two parts, 1012 and 22720, that added together give a palindrome (23732).

The spelling of 101222720 in words is "one hundred one million, two hundred twenty-two thousand, seven hundred twenty".