19112212001 has 4 divisors (see below), whose sum is σ = 19123242132. Its totient is φ = 19101181872.

The previous prime is 19112211983. The next prime is 19112212003. The reversal of 19112212001 is 10021221191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4785318976 + 14326893025 = 69176^2 + 119695^2 .

It is a cyclic number.

It is not a de Polignac number, because 19112212001 - 2²⁶ = 19045103137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19112212003) 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, 5512466 + ... + 5515931.

It is an arithmetic number, because the mean of its divisors is an integer number (4780810533).

Almost surely, 2^19112212001 is an apocalyptic number.

It is an amenable number.

19112212001 is a deficient number, since it is larger than the sum of its proper divisors (11030131).

19112212001 is a wasteful number, since it uses less digits than its factorization.

19112212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11030130.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 19112212001 its reverse (10021221191), we get a palindrome (29133433192).

The spelling of 19112212001 in words is "nineteen billion, one hundred twelve million, two hundred twelve thousand, one".