19122021 has 8 divisors (see below), whose sum is σ = 28328960. Its totient is φ = 12747996.

The previous prime is 19122013. The next prime is 19122023. The reversal of 19122021 is 12022191.

It is not a de Polignac number, because 19122021 - 2³ = 19122013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19121985 and 19122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19122023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354085 + ... + 354138.

It is an arithmetic number, because the mean of its divisors is an integer number (3541120).

Almost surely, 2^19122021 is an apocalyptic number.

It is an amenable number.

19122021 is a deficient number, since it is larger than the sum of its proper divisors (9206939).

19122021 is an equidigital number, since it uses as much as digits as its factorization.

19122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708232 (or 708226 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 19122021 is about 4372.8733116796. The cubic root of 19122021 is about 267.4101762642.

The spelling of 19122021 in words is "nineteen million, one hundred twenty-two thousand, twenty-one".