21519430 has 8 divisors (see below), whose sum is σ = 38734992. Its totient is φ = 8607768.

The previous prime is 21519427. The next prime is 21519437. The reversal of 21519430 is 3491512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21519395 and 21519404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21519437) 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, 1075962 + ... + 1075981.

It is an arithmetic number, because the mean of its divisors is an integer number (4841874).

Almost surely, 2^21519430 is an apocalyptic number.

21519430 is a deficient number, since it is larger than the sum of its proper divisors (17215562).

21519430 is a wasteful number, since it uses less digits than its factorization.

21519430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151950.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21519430 is about 4638.9039653780. The cubic root of 21519430 is about 278.1486274587.

The spelling of 21519430 in words is "twenty-one million, five hundred nineteen thousand, four hundred thirty".