126101221 has 4 divisors (see below), whose sum is σ = 127094272. Its totient is φ = 125108172.

The previous prime is 126101207. The next prime is 126101299. The reversal of 126101221 is 122101621.

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: 122101621 = 59 ⋅2069519.

It is a cyclic number.

It is not a de Polignac number, because 126101221 - 2⁷ = 126101093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126101195 and 126101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126101021) 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, 496335 + ... + 496588.

It is an arithmetic number, because the mean of its divisors is an integer number (31773568).

Almost surely, 2^126101221 is an apocalyptic number.

It is an amenable number.

126101221 is a deficient number, since it is larger than the sum of its proper divisors (993051).

126101221 is an equidigital number, since it uses as much as digits as its factorization.

126101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993050.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 126101221 is about 11229.4799968654. The cubic root of 126101221 is about 501.4640038683.

Adding to 126101221 its reverse (122101621), we get a palindrome (248202842).

It can be divided in two parts, 12610 and 1221, that added together give a palindrome (13831).

The spelling of 126101221 in words is "one hundred twenty-six million, one hundred one thousand, two hundred twenty-one".