19221040 has 20 divisors (see below), whose sum is σ = 44689104. Its totient is φ = 7688384.

The previous prime is 19221029. The next prime is 19221047. The reversal of 19221040 is 4012291.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 19220999 and 19221017.

It is not an unprimeable number, because it can be changed into a prime (19221047) 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, 120052 + ... + 120211.

Almost surely, 2^19221040 is an apocalyptic number.

19221040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19221040 is an abundant number, since it is smaller than the sum of its proper divisors (25468064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19221040 is a wasteful number, since it uses less digits than its factorization.

19221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240276 (or 240270 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 19221040 is about 4384.1806532122. The cubic root of 19221040 is about 267.8709559184.

The spelling of 19221040 in words is "nineteen million, two hundred twenty-one thousand, forty".