11312001201221 has 16 divisors (see below), whose sum is σ = 13147475076480. Its totient is φ = 9531404628480.

The previous prime is 11312001201167. The next prime is 11312001201233. The reversal of 11312001201221 is 12210210021311.

It is a happy number.

It is not a de Polignac number, because 11312001201221 - 2¹⁸ = 11312000939077 is a prime.

It is a super-2 number, since 2×11312001201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11312001201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312001209221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15796781 + ... + 16497341.

It is an arithmetic number, because the mean of its divisors is an integer number (821717192280).

Almost surely, 2^{11312001201221} is an apocalyptic number.

It is an amenable number.

11312001201221 is a deficient number, since it is larger than the sum of its proper divisors (1835473875259).

11312001201221 is an equidigital number, since it uses as much as digits as its factorization.

11312001201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739724.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11312001201221 its reverse (12210210021311), we get a palindrome (23522211222532).

The spelling of 11312001201221 in words is "eleven trillion, three hundred twelve billion, one million, two hundred one thousand, two hundred twenty-one".