19221490 has 32 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 7320768.

The previous prime is 19221451. The next prime is 19221493. The reversal of 19221490 is 9412291.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19221493) 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 15 ways as a sum of consecutive naturals, for example, 22491 + ... + 23329.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^19221490 is an apocalyptic number.

19221490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19221490 is a deficient number, since it is larger than the sum of its proper divisors (17066510).

19221490 is a wasteful number, since it uses less digits than its factorization.

19221490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19221490 is about 4384.2319737897. The cubic root of 19221490 is about 267.8730463531.

The spelling of 19221490 in words is "nineteen million, two hundred twenty-one thousand, four hundred ninety".