1201222121 has 4 divisors (see below), whose sum is σ = 1310424144. Its totient is φ = 1092020100.

The previous prime is 1201222117. The next prime is 1201222129. The reversal of 1201222121 is 1212221021.

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.

It is a cyclic number.

It is not a de Polignac number, because 1201222121 - 2² = 1201222117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201222096 and 1201222105.

It is not an unprimeable number, because it can be changed into a prime (1201222129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54600995 + ... + 54601016.

It is an arithmetic number, because the mean of its divisors is an integer number (327606036).

Almost surely, 2^1201222121 is an apocalyptic number.

1201222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201222121 is a deficient number, since it is larger than the sum of its proper divisors (109202023).

1201222121 is a wasteful number, since it uses less digits than its factorization.

1201222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109202022.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1201222121 is about 34658.6514596284. The cubic root of 1201222121 is about 1063.0191960502.

Adding to 1201222121 its reverse (1212221021), we get a palindrome (2413443142).

It can be divided in two parts, 1201 and 222121, that added together give a palindrome (223322).

The spelling of 1201222121 in words is "one billion, two hundred one million, two hundred twenty-two thousand, one hundred twenty-one".