11211212001 has 32 divisors (see below), whose sum is σ = 16497271296. Its totient is φ = 6715904000.

The previous prime is 11211211997. The next prime is 11211212009. The reversal of 11211212001 is 10021211211.

It is a cyclic number.

It is not a de Polignac number, because 11211212001 - 2² = 11211211997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211212009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1105966 + ... + 1116056.

It is an arithmetic number, because the mean of its divisors is an integer number (515539728).

Almost surely, 2^11211212001 is an apocalyptic number.

11211212001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211212001 is a deficient number, since it is larger than the sum of its proper divisors (5286059295).

11211212001 is a wasteful number, since it uses less digits than its factorization.

11211212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10493.

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

Adding to 11211212001 its reverse (10021211211), we get a palindrome (21232423212).

The spelling of 11211212001 in words is "eleven billion, two hundred eleven million, two hundred twelve thousand, one".