19925421 has 8 divisors (see below), whose sum is σ = 27017760. Its totient is φ = 13058352.

The previous prime is 19925419. The next prime is 19925431. The reversal of 19925421 is 12452991.

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

It is not a de Polignac number, because 19925421 - 2¹ = 19925419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19925431) 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, 56110 + ... + 56463.

It is an arithmetic number, because the mean of its divisors is an integer number (3377220).

Almost surely, 2^19925421 is an apocalyptic number.

It is an amenable number.

19925421 is a deficient number, since it is larger than the sum of its proper divisors (7092339).

19925421 is a wasteful number, since it uses less digits than its factorization.

19925421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112635.

The product of its digits is 6480, while the sum is 33.

The square root of 19925421 is about 4463.7899816188. The cubic root of 19925421 is about 271.1039438232.

The spelling of 19925421 in words is "nineteen million, nine hundred twenty-five thousand, four hundred twenty-one".