1211211002001 has 48 divisors (see below), whose sum is σ = 2184748533632. Its totient is φ = 580800464640.

The previous prime is 1211211001993. The next prime is 1211211002041. The reversal of 1211211002001 is 1002001121121.

It is not a de Polignac number, because 1211211002001 - 2³ = 1211211001993 is a prime.

It is a super-4 number, since 4×1211211002001⁴ (a number of 49 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211211002041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18300316 + ... + 18366381.

Almost surely, 2^{1211211002001} is an apocalyptic number.

1211211002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211211002001 is a deficient number, since it is larger than the sum of its proper divisors (973537531631).

1211211002001 is a wasteful number, since it uses less digits than its factorization.

1211211002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36666742 (or 36666731 counting only the distinct ones).

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

Adding to 1211211002001 its reverse (1002001121121), we get a palindrome (2213212123122).

It can be divided in two parts, 121121 and 1002001, that multiplied together give a palindrome (121363363121).

The spelling of 1211211002001 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two thousand, one".