1221201201 has 16 divisors (see below), whose sum is σ = 1793884608. Its totient is φ = 732792000.

The previous prime is 1221201181. The next prime is 1221201209. The reversal of 1221201201 is 1021021221.

It is not a de Polignac number, because 1221201201 - 2¹³ = 1221193009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221201209) 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, 179866 + ... + 186531.

It is an arithmetic number, because the mean of its divisors is an integer number (112117788).

Almost surely, 2^1221201201 is an apocalyptic number.

1221201201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221201201 is a deficient number, since it is larger than the sum of its proper divisors (572683407).

1221201201 is a wasteful number, since it uses less digits than its factorization.

1221201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366512.

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

The square root of 1221201201 is about 34945.6893049772. The cubic root of 1221201201 is about 1068.8803033630.

Adding to 1221201201 its reverse (1021021221), we get a palindrome (2242222422).

It can be divided in two parts, 122120 and 1201, that added together give a palindrome (123321).

The spelling of 1221201201 in words is "one billion, two hundred twenty-one million, two hundred one thousand, two hundred one".