1221211201 has 8 divisors (see below), whose sum is σ = 1477768320. Its totient is φ = 985178688.

The previous prime is 1221211181. The next prime is 1221211231. The reversal of 1221211201 is 1021121221.

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 1221211201 - 2¹⁹ = 1220686913 is a prime.

It is a super-3 number, since 3×1221211201³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5131021 + ... + 5131258.

It is an arithmetic number, because the mean of its divisors is an integer number (184721040).

Almost surely, 2^1221211201 is an apocalyptic number.

It is an amenable number.

1221211201 is a deficient number, since it is larger than the sum of its proper divisors (256557119).

1221211201 is a wasteful number, since it uses less digits than its factorization.

1221211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262303.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1221211201 is about 34945.8323838480. The cubic root of 1221211201 is about 1068.8832209204.

Adding to 1221211201 its reverse (1021121221), we get a palindrome (2242332422).

The spelling of 1221211201 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred one".