19221628 has 12 divisors (see below), whose sum is σ = 35616672. Its totient is φ = 9045440.

The previous prime is 19221623. The next prime is 19221641. The reversal of 19221628 is 82612291.

It is a self number, because there is not a number n which added to its sum of digits gives 19221628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19221623) 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, 141268 + ... + 141403.

It is an arithmetic number, because the mean of its divisors is an integer number (2968056).

Almost surely, 2^19221628 is an apocalyptic number.

It is an amenable number.

19221628 is a deficient number, since it is larger than the sum of its proper divisors (16395044).

19221628 is a wasteful number, since it uses less digits than its factorization.

19221628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282692 (or 282690 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 19221628 is about 4384.2477119798. The cubic root of 19221628 is about 267.8736874132.

The spelling of 19221628 in words is "nineteen million, two hundred twenty-one thousand, six hundred twenty-eight".