1221110102211 has 16 divisors (see below), whose sum is σ = 1630156993920. Its totient is φ = 813068917760.

The previous prime is 1221110102209. The next prime is 1221110102213. The reversal of 1221110102211 is 1122010111221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221110102209) and next prime (1221110102213).

It is a cyclic number.

It is not a de Polignac number, because 1221110102211 - 2¹ = 1221110102209 is a prime.

It is a super-2 number, since 2×1221110102211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221110102213) 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, 8087536 + ... + 8237138.

It is an arithmetic number, because the mean of its divisors is an integer number (101884812120).

Almost surely, 2^{1221110102211} is an apocalyptic number.

1221110102211 is a deficient number, since it is larger than the sum of its proper divisors (409046891709).

1221110102211 is a wasteful number, since it uses less digits than its factorization.

1221110102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152946.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221110102211 its reverse (1122010111221), we get a palindrome (2343120213432).

The spelling of 1221110102211 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred two thousand, two hundred eleven".