1211121021001 has 8 divisors (see below), whose sum is σ = 1211803943040. Its totient is φ = 1210438275552.

The previous prime is 1211121020981. The next prime is 1211121021083. The reversal of 1211121021001 is 1001201211121.

It is a happy number.

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 1211121021001 - 2⁵ = 1211121020969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211121091001) 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, 15109836 + ... + 15189778.

It is an arithmetic number, because the mean of its divisors is an integer number (151475492880).

Almost surely, 2^{1211121021001} is an apocalyptic number.

It is an amenable number.

1211121021001 is a deficient number, since it is larger than the sum of its proper divisors (682922039).

1211121021001 is an equidigital number, since it uses as much as digits as its factorization.

1211121021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88295.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211121021001 its reverse (1001201211121), we get a palindrome (2212322232122).

The spelling of 1211121021001 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, twenty-one thousand, one".