19442521 has 16 divisors (see below), whose sum is σ = 23341824. Its totient is φ = 15833664.

The previous prime is 19442519. The next prime is 19442531. The reversal of 19442521 is 12524491.

It is not a de Polignac number, because 19442521 - 2¹ = 19442519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19442521.

It is not an unprimeable number, because it can be changed into a prime (19442531) 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, 31411 + ... + 32023.

It is an arithmetic number, because the mean of its divisors is an integer number (1458864).

Almost surely, 2^19442521 is an apocalyptic number.

It is an amenable number.

19442521 is a deficient number, since it is larger than the sum of its proper divisors (3899303).

19442521 is a wasteful number, since it uses less digits than its factorization.

19442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840.

The product of its digits is 2880, while the sum is 28.

The square root of 19442521 is about 4409.3674149474. The cubic root of 19442521 is about 268.8959073583.

It can be divided in two parts, 1944 and 2521, that added together give a triangular number (4465 = T₉₄).

The spelling of 19442521 in words is "nineteen million, four hundred forty-two thousand, five hundred twenty-one".