1211220112101 has 16 divisors (see below), whose sum is σ = 1649372544000. Its totient is φ = 790274951408.

The previous prime is 1211220112097. The next prime is 1211220112121. The reversal of 1211220112101 is 1012110221121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211220112101 - 2² = 1211220112097 is a prime.

It is a super-4 number, since 4×1211220112101⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220112121) 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, 5120950 + ... + 5352248.

It is an arithmetic number, because the mean of its divisors is an integer number (103085784000).

Almost surely, 2^{1211220112101} is an apocalyptic number.

It is an amenable number.

1211220112101 is a deficient number, since it is larger than the sum of its proper divisors (438152431899).

1211220112101 is a wasteful number, since it uses less digits than its factorization.

1211220112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268488.

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

Adding to 1211220112101 its reverse (1012110221121), we get a palindrome (2223330333222).

The spelling of 1211220112101 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred twelve thousand, one hundred one".