1011221012211 has 16 divisors (see below), whose sum is σ = 1353388227840. Its totient is φ = 671600871200.

The previous prime is 1011221012171. The next prime is 1011221012227. The reversal of 1011221012211 is 1122101221101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1011221012211 - 2⁶ = 1011221012147 is a prime.

It is a super-2 number, since 2×1011221012211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1011221012251) 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, 20029546 + ... + 20079968.

It is an arithmetic number, because the mean of its divisors is an integer number (84586764240).

Almost surely, 2^{1011221012211} is an apocalyptic number.

1011221012211 is a deficient number, since it is larger than the sum of its proper divisors (342167215629).

1011221012211 is a wasteful number, since it uses less digits than its factorization.

1011221012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75546.

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

Adding to 1011221012211 its reverse (1122101221101), we get a palindrome (2133322233312).

The spelling of 1011221012211 in words is "one trillion, eleven billion, two hundred twenty-one million, twelve thousand, two hundred eleven".