19112021 has 2 divisors, whose sum is σ = 19112022. Its totient is φ = 19112020.

The previous prime is 19111999. The next prime is 19112053. The reversal of 19112021 is 12021191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 3422500 = 3961^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 19112021 - 2¹⁰ = 19110997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19112321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9556010 + 9556011.

It is an arithmetic number, because the mean of its divisors is an integer number (9556011).

Almost surely, 2^19112021 is an apocalyptic number.

It is an amenable number.

19112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19112021 is an equidigital number, since it uses as much as digits as its factorization.

19112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 19112021 is about 4371.7297491954. The cubic root of 19112021 is about 267.3635534369.

The spelling of 19112021 in words is "nineteen million, one hundred twelve thousand, twenty-one".