1201212221 has 8 divisors (see below), whose sum is σ = 1314550944. Its totient is φ = 1088563120.

The previous prime is 1201212217. The next prime is 1201212253. The reversal of 1201212221 is 1222121021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201212221 - 2² = 1201212217 is a prime.

It is a super-3 number, since 3×1201212221³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1201212196 and 1201212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201292221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168755 + ... + 175728.

It is an arithmetic number, because the mean of its divisors is an integer number (164318868).

Almost surely, 2^1201212221 is an apocalyptic number.

1201212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212221 is a deficient number, since it is larger than the sum of its proper divisors (113338723).

1201212221 is a wasteful number, since it uses less digits than its factorization.

1201212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344811.

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

The square root of 1201212221 is about 34658.5086378511. The cubic root of 1201212221 is about 1063.0162757135.

Adding to 1201212221 its reverse (1222121021), we get a palindrome (2423333242).

The spelling of 1201212221 in words is "one billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".