21407485 has 8 divisors (see below), whose sum is σ = 28024416. Its totient is φ = 15569040.

The previous prime is 21407479. The next prime is 21407521. The reversal of 21407485 is 58470412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21407485 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194559 + ... + 194668.

It is an arithmetic number, because the mean of its divisors is an integer number (3503052).

Almost surely, 2^21407485 is an apocalyptic number.

It is an amenable number.

21407485 is a deficient number, since it is larger than the sum of its proper divisors (6616931).

21407485 is a wasteful number, since it uses less digits than its factorization.

21407485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389243.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 21407485 is about 4626.8223436825. The cubic root of 21407485 is about 277.6654749884.

Adding to 21407485 its reverse (58470412), we get a palindrome (79877897).

The spelling of 21407485 in words is "twenty-one million, four hundred seven thousand, four hundred eighty-five".