1210211209997 has 4 divisors (see below), whose sum is σ = 1242919621116. Its totient is φ = 1177502798880.

The previous prime is 1210211209901. The next prime is 1210211210009. The reversal of 1210211209997 is 7999021120121.

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 1169380541641 + 40830668356 = 1081379^2 + 202066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210211209997 - 2³⁸ = 935333303053 is a prime.

It is a super-2 number, since 2×1210211209997² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210211205997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16354205504 + ... + 16354205577.

It is an arithmetic number, because the mean of its divisors is an integer number (310729905279).

Almost surely, 2^{1210211209997} is an apocalyptic number.

It is an amenable number.

1210211209997 is a deficient number, since it is larger than the sum of its proper divisors (32708411119).

1210211209997 is an equidigital number, since it uses as much as digits as its factorization.

1210211209997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32708411118.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 1210211209997 in words is "one trillion, two hundred ten billion, two hundred eleven million, two hundred nine thousand, nine hundred ninety-seven".