1211212010001 has 24 divisors (see below), whose sum is σ = 1895849567040. Its totient is φ = 685771404192.

The previous prime is 1211212009999. The next prime is 1211212010003. The reversal of 1211212010001 is 1000102121121.

It is an interprime number because it is at equal distance from previous prime (1211212009999) and next prime (1211212010003).

It is not a de Polignac number, because 1211212010001 - 2¹ = 1211212009999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211212010003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37780021 + ... + 37812066.

It is an arithmetic number, because the mean of its divisors is an integer number (78993731960).

Almost surely, 2^{1211212010001} is an apocalyptic number.

It is an amenable number.

1211212010001 is a deficient number, since it is larger than the sum of its proper divisors (684637557039).

1211212010001 is a wasteful number, since it uses less digits than its factorization.

1211212010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75592213 (or 75592206 counting only the distinct ones).

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

Adding to 1211212010001 its reverse (1000102121121), we get a palindrome (2211314131122).

It can be divided in two parts, 12112120 and 10001, that added together give a palindrome (12122121).

The spelling of 1211212010001 in words is "one trillion, two hundred eleven billion, two hundred twelve million, ten thousand, one".