19223121 has 8 divisors (see below), whose sum is σ = 25687584. Its totient is φ = 12787040.

The previous prime is 19223119. The next prime is 19223123. The reversal of 19223121 is 12132291.

It is an interprime number because it is at equal distance from previous prime (19223119) and next prime (19223123).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19223121 - 2¹ = 19223119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19223123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5460 + ... + 8261.

It is an arithmetic number, because the mean of its divisors is an integer number (3210948).

Almost surely, 2^19223121 is an apocalyptic number.

It is an amenable number.

19223121 is a deficient number, since it is larger than the sum of its proper divisors (6464463).

19223121 is a wasteful number, since it uses less digits than its factorization.

19223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14191.

The product of its digits is 216, while the sum is 21.

The square root of 19223121 is about 4384.4179773375. The cubic root of 19223121 is about 267.8806227443.

Subtracting from 19223121 its sum of digits (21), we obtain a triangular number (19223100 = T₆₂₀₀).

The spelling of 19223121 in words is "nineteen million, two hundred twenty-three thousand, one hundred twenty-one".