1211112012001 has 4 divisors (see below), whose sum is σ = 1219132621504. Its totient is φ = 1203091402500.

The previous prime is 1211112011999. The next prime is 1211112012031. The reversal of 1211112012001 is 1002102111121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211112012001 - 2¹ = 1211112011999 is a prime.

It is a super-2 number, since 2×1211112012001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211112012031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4010304525 + ... + 4010304826.

It is an arithmetic number, because the mean of its divisors is an integer number (304783155376).

Almost surely, 2^{1211112012001} is an apocalyptic number.

It is an amenable number.

1211112012001 is a deficient number, since it is larger than the sum of its proper divisors (8020609503).

1211112012001 is an equidigital number, since it uses as much as digits as its factorization.

1211112012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8020609502.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211112012001 its reverse (1002102111121), we get a palindrome (2213214123122).

The spelling of 1211112012001 in words is "one trillion, two hundred eleven billion, one hundred twelve million, twelve thousand, one".