1221112202211 has 24 divisors (see below), whose sum is σ = 1928127961344. Its totient is φ = 738548325360.

The previous prime is 1221112202207. The next prime is 1221112202221. The reversal of 1221112202211 is 1122022111221.

1221112202211 is a `hidden beast` number, since 1 + 221 + 1 + 1 + 220 + 221 + 1 = 666.

It is not a de Polignac number, because 1221112202211 - 2² = 1221112202207 is a prime.

It is a super-2 number, since 2×1221112202211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221112202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12615511 + ... + 12711936.

It is an arithmetic number, because the mean of its divisors is an integer number (80338665056).

Almost surely, 2^{1221112202211} is an apocalyptic number.

1221112202211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221112202211 is a deficient number, since it is larger than the sum of its proper divisors (707015759133).

1221112202211 is a wasteful number, since it uses less digits than its factorization.

1221112202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25327951 (or 25327948 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221112202211 its reverse (1122022111221), we get a palindrome (2343134313432).

It can be divided in two parts, 1221 and 112202211, that multiplied together give a palindrome (136998899631).

The spelling of 1221112202211 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred two thousand, two hundred eleven".