1211213122001 has 16 divisors (see below), whose sum is σ = 1268573840640. Its totient is φ = 1154251084800.

The previous prime is 1211213121953. The next prime is 1211213122013. The reversal of 1211213122001 is 1002213121121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211213122001 - 2³⁴ = 1194033252817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211213122061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7510745 + ... + 7670313.

It is an arithmetic number, because the mean of its divisors is an integer number (79285865040).

Almost surely, 2^{1211213122001} is an apocalyptic number.

It is an amenable number.

1211213122001 is a deficient number, since it is larger than the sum of its proper divisors (57360718639).

1211213122001 is a wasteful number, since it uses less digits than its factorization.

1211213122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160816.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211213122001 its reverse (1002213121121), we get a palindrome (2213426243122).

The spelling of 1211213122001 in words is "one trillion, two hundred eleven billion, two hundred thirteen million, one hundred twenty-two thousand, one".