1201122421 has 4 divisors (see below), whose sum is σ = 1203482700. Its totient is φ = 1198762144.

The previous prime is 1201122383. The next prime is 1201122427. The reversal of 1201122421 is 1242211021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242211021 = 67 ⋅18540463.

It can be written as a sum of positive squares in 2 ways, for example, as 786185521 + 414936900 = 28039^2 + 20370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201122421 - 2¹¹ = 1201120373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201122395 and 1201122404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122427) 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, 1179376 + ... + 1180393.

It is an arithmetic number, because the mean of its divisors is an integer number (300870675).

Almost surely, 2^1201122421 is an apocalyptic number.

It is an amenable number.

1201122421 is a deficient number, since it is larger than the sum of its proper divisors (2360279).

1201122421 is an equidigital number, since it uses as much as digits as its factorization.

1201122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360278.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1201122421 is about 34657.2131164639. The cubic root of 1201122421 is about 1062.9897854623.

Adding to 1201122421 its reverse (1242211021), we get a palindrome (2443333442).

The spelling of 1201122421 in words is "one billion, two hundred one million, one hundred twenty-two thousand, four hundred twenty-one".