1201222101 has 16 divisors (see below), whose sum is σ = 1619753408. Its totient is φ = 791769600.

The previous prime is 1201222093. The next prime is 1201222103. The reversal of 1201222101 is 1012221021.

It is not a de Polignac number, because 1201222101 - 2³ = 1201222093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201222103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505446 + ... + 507816.

It is an arithmetic number, because the mean of its divisors is an integer number (101234588).

Almost surely, 2^1201222101 is an apocalyptic number.

It is an amenable number.

1201222101 is a deficient number, since it is larger than the sum of its proper divisors (418531307).

1201222101 is a wasteful number, since it uses less digits than its factorization.

1201222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1201222101 is about 34658.6511711001. The cubic root of 1201222101 is about 1063.0191901505.

Adding to 1201222101 its reverse (1012221021), we get a palindrome (2213443122).

It can be divided in two parts, 120 and 1222101, that added together give a palindrome (1222221).

The spelling of 1201222101 in words is "one billion, two hundred one million, two hundred twenty-two thousand, one hundred one".