1210021212001 has 18 divisors (see below), whose sum is σ = 1495244787558. Its totient is φ = 976151554560.

The previous prime is 1210021211983. The next prime is 1210021212007. The reversal of 1210021212001 is 1002121200121.

It can be written as a sum of positive squares in 3 ways, for example, as 297107845776 + 912913366225 = 545076^2 + 955465^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1210021212001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210021212007) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 42709560 + ... + 42737881.

Almost surely, 2^{1210021212001} is an apocalyptic number.

It is an amenable number.

1210021212001 is a deficient number, since it is larger than the sum of its proper divisors (285223575557).

1210021212001 is an equidigital number, since it uses as much as digits as its factorization.

1210021212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85447489 (or 85447465 counting only the distinct ones).

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

Adding to 1210021212001 its reverse (1002121200121), we get a palindrome (2212142412122).

The spelling of 1210021212001 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred twelve thousand, one".