1121221211001 has 32 divisors (see below), whose sum is σ = 1563757334400. Its totient is φ = 713867489280.

The previous prime is 1121221210999. The next prime is 1121221211021. The reversal of 1121221211001 is 1001121221211.

It is a happy number.

It is not a de Polignac number, because 1121221211001 - 2¹ = 1121221210999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121221211021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4199385 + ... + 4458393.

It is an arithmetic number, because the mean of its divisors is an integer number (48867416700).

Almost surely, 2^{1121221211001} is an apocalyptic number.

It is an amenable number.

1121221211001 is a deficient number, since it is larger than the sum of its proper divisors (442536123399).

1121221211001 is a wasteful number, since it uses less digits than its factorization.

1121221211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259769.

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

Adding to 1121221211001 its reverse (1001121221211), we get a palindrome (2122342432212).

It can be divided in two parts, 1121 and 221211001, that added together give a palindrome (221212122).

The spelling of 1121221211001 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, one".