21486407 has 4 divisors (see below), whose sum is σ = 21683640. Its totient is φ = 21289176.

The previous prime is 21486403. The next prime is 21486433. The reversal of 21486407 is 70468412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21486407 - 2² = 21486403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486403) 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, 98453 + ... + 98670.

It is an arithmetic number, because the mean of its divisors is an integer number (5420910).

Almost surely, 2^21486407 is an apocalyptic number.

21486407 is a deficient number, since it is larger than the sum of its proper divisors (197233).

21486407 is a wasteful number, since it uses less digits than its factorization.

21486407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197232.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21486407 is about 4635.3432451114. The cubic root of 21486407 is about 278.0062754134.

The spelling of 21486407 in words is "twenty-one million, four hundred eighty-six thousand, four hundred seven".