19230021 has 16 divisors (see below), whose sum is σ = 28835520. Its totient is φ = 12664080.

The previous prime is 19230019. The next prime is 19230023. The reversal of 19230021 is 12003291.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19230019) and next prime (19230023).

It is not a de Polignac number, because 19230021 - 2¹ = 19230019 is a prime.

It is a super-3 number, since 3×19230021³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19229976 and 19230003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19230023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1802220).

Almost surely, 2^19230021 is an apocalyptic number.

It is an amenable number.

19230021 is a deficient number, since it is larger than the sum of its proper divisors (9605499).

19230021 is an equidigital number, since it uses as much as digits as its factorization.

19230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8673 (or 8667 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 19230021 is about 4385.2047842718. The cubic root of 19230021 is about 267.9126701797.

The spelling of 19230021 in words is "nineteen million, two hundred thirty thousand, twenty-one".