1020121211001 has 16 divisors (see below), whose sum is σ = 1382496657408. Its totient is φ = 668913888000.

The previous prime is 1020121210991. The next prime is 1020121211047. The reversal of 1020121211001 is 1001121210201.

It is not a de Polignac number, because 1020121211001 - 2⁷ = 1020121210873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020121211101) 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, 12044401 + ... + 12128801.

It is an arithmetic number, because the mean of its divisors is an integer number (86406041088).

Almost surely, 2^{1020121211001} is an apocalyptic number.

It is an amenable number.

1020121211001 is a deficient number, since it is larger than the sum of its proper divisors (362375446407).

1020121211001 is an equidigital number, since it uses as much as digits as its factorization.

1020121211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150512.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1020121211001 its reverse (1001121210201), we get a palindrome (2021242421202).

The spelling of 1020121211001 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred eleven thousand, one".