1011221122121 has 8 divisors (see below), whose sum is σ = 1155870384384. Its totient is φ = 866619135360.

The previous prime is 1011221122103. The next prime is 1011221122193. The reversal of 1011221122121 is 1212211221101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011221122121 - 2¹⁴ = 1011221105737 is a prime.

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 1011221122121.

It is not an unprimeable number, because it can be changed into a prime (1011221122321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11773025 + ... + 11858606.

It is an arithmetic number, because the mean of its divisors is an integer number (144483798048).

Almost surely, 2^{1011221122121} is an apocalyptic number.

It is an amenable number.

1011221122121 is a deficient number, since it is larger than the sum of its proper divisors (144649262263).

1011221122121 is an equidigital number, since it uses as much as digits as its factorization.

1011221122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23637751.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1011221122121 its reverse (1212211221101), we get a palindrome (2223432343222).

The spelling of 1011221122121 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".