2101021212001 has 4 divisors (see below), whose sum is σ = 2104564250052. Its totient is φ = 2097478173952.

The previous prime is 2101021211999. The next prime is 2101021212007. The reversal of 2101021212001 is 1002121201012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1427104998225 + 673916213776 = 1194615^2 + 820924^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101021212001 - 2¹ = 2101021211999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101021212007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771518136 + ... + 1771519321.

It is an arithmetic number, because the mean of its divisors is an integer number (526141062513).

Almost surely, 2^{2101021212001} is an apocalyptic number.

It is an amenable number.

2101021212001 is a deficient number, since it is larger than the sum of its proper divisors (3543038051).

2101021212001 is an equidigital number, since it uses as much as digits as its factorization.

2101021212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543038050.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101021212001 its reverse (1002121201012), we get a palindrome (3103142413013).

The spelling of 2101021212001 in words is "two trillion, one hundred one billion, twenty-one million, two hundred twelve thousand, one".