19100212121 has 4 divisors (see below), whose sum is σ = 19226703744. Its totient is φ = 18973720500.

The previous prime is 19100212057. The next prime is 19100212141. The reversal of 19100212121 is 12121200191.

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 19100212121 - 2⁶ = 19100212057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19100212093 and 19100212102.

It is not an unprimeable number, because it can be changed into a prime (19100212141) 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, 63245585 + ... + 63245886.

It is an arithmetic number, because the mean of its divisors is an integer number (4806675936).

Almost surely, 2^19100212121 is an apocalyptic number.

It is an amenable number.

19100212121 is a deficient number, since it is larger than the sum of its proper divisors (126491623).

19100212121 is a wasteful number, since it uses less digits than its factorization.

19100212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126491622.

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

The spelling of 19100212121 in words is "nineteen billion, one hundred million, two hundred twelve thousand, one hundred twenty-one".