21460929 has 16 divisors (see below), whose sum is σ = 32780160. Its totient is φ = 12234240.

The previous prime is 21460927. The next prime is 21460939. The reversal of 21460929 is 92906412.

It is not a de Polignac number, because 21460929 - 2¹ = 21460927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21460929.

It is not an unprimeable number, because it can be changed into a prime (21460927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10417 + ... + 12305.

It is an arithmetic number, because the mean of its divisors is an integer number (2048760).

Almost surely, 2^21460929 is an apocalyptic number.

It is an amenable number.

21460929 is a deficient number, since it is larger than the sum of its proper divisors (11319231).

21460929 is a wasteful number, since it uses less digits than its factorization.

21460929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21460929 is about 4632.5941976392. The cubic root of 21460929 is about 277.8963478461.

The spelling of 21460929 in words is "twenty-one million, four hundred sixty thousand, nine hundred twenty-nine".