21464405 has 8 divisors (see below), whose sum is σ = 26877312. Its totient is φ = 16424848.

The previous prime is 21464393. The next prime is 21464407. The reversal of 21464405 is 50446412.

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

It is a cyclic number.

It is not a de Polignac number, because 21464405 - 2¹⁸ = 21202261 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 (21464407) 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, 93209 + ... + 93438.

It is an arithmetic number, because the mean of its divisors is an integer number (3359664).

Almost surely, 2^21464405 is an apocalyptic number.

It is an amenable number.

21464405 is a deficient number, since it is larger than the sum of its proper divisors (5412907).

21464405 is a wasteful number, since it uses less digits than its factorization.

21464405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186675.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 21464405 is about 4632.9693502116. The cubic root of 21464405 is about 277.9113505448.

The spelling of 21464405 in words is "twenty-one million, four hundred sixty-four thousand, four hundred five".