21500414 has 8 divisors (see below), whose sum is σ = 34731480. Its totient is φ = 9923256.

The previous prime is 21500321. The next prime is 21500429. The reversal of 21500414 is 41400512.

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 = 21500392 and 21500401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413444 + ... + 413495.

It is an arithmetic number, because the mean of its divisors is an integer number (4341435).

Almost surely, 2^21500414 is an apocalyptic number.

21500414 is a deficient number, since it is larger than the sum of its proper divisors (13231066).

21500414 is a wasteful number, since it uses less digits than its factorization.

21500414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826954.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21500414 is about 4636.8538903011. The cubic root of 21500414 is about 278.0666731032.

Adding to 21500414 its reverse (41400512), we get a palindrome (62900926).

The spelling of 21500414 in words is "twenty-one million, five hundred thousand, four hundred fourteen".