21460953 has 8 divisors (see below), whose sum is σ = 30297888. Its totient is φ = 13465664.

The previous prime is 21460949. The next prime is 21460963. The reversal of 21460953 is 35906412.

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 21460953 - 2² = 21460949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21460953.

It is not an unprimeable number, because it can be changed into a prime (21460963) 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, 210351 + ... + 210452.

It is an arithmetic number, because the mean of its divisors is an integer number (3787236).

Almost surely, 2^21460953 is an apocalyptic number.

It is an amenable number.

21460953 is a deficient number, since it is larger than the sum of its proper divisors (8836935).

21460953 is a wasteful number, since it uses less digits than its factorization.

21460953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420823.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21460953 is about 4632.5967879797. The cubic root of 21460953 is about 277.8964514376.

The spelling of 21460953 in words is "twenty-one million, four hundred sixty thousand, nine hundred fifty-three".