1211001022121 has 8 divisors (see below), whose sum is σ = 1321257401184. Its totient is φ = 1100772205920.

The previous prime is 1211001022109. The next prime is 1211001022123. The reversal of 1211001022121 is 1212201001121.

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 1211001022121 - 2¹⁴ = 1211001005737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211001022096 and 1211001022105.

It is not an unprimeable number, because it can be changed into a prime (1211001022123) 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, 6798791 + ... + 6974636.

It is an arithmetic number, because the mean of its divisors is an integer number (165157175148).

Almost surely, 2^{1211001022121} is an apocalyptic number.

1211001022121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211001022121 is a deficient number, since it is larger than the sum of its proper divisors (110256379063).

1211001022121 is a wasteful number, since it uses less digits than its factorization.

1211001022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13781431.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211001022121 its reverse (1212201001121), we get a palindrome (2423202023242).

The spelling of 1211001022121 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred twenty-one".