21426853 has 16 divisors (see below), whose sum is σ = 25776000. Its totient is φ = 17422272.

The previous prime is 21426841. The next prime is 21426901. The reversal of 21426853 is 35862412.

It is a de Polignac number, because none of the positive numbers 2^k-21426853 is a prime.

It is a super-2 number, since 2×21426853² = 918220058967218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11083 + ... + 12871.

It is an arithmetic number, because the mean of its divisors is an integer number (1611000).

Almost surely, 2^21426853 is an apocalyptic number.

It is an amenable number.

21426853 is a deficient number, since it is larger than the sum of its proper divisors (4349147).

21426853 is a wasteful number, since it uses less digits than its factorization.

21426853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its digits is 11520, while the sum is 31.

The square root of 21426853 is about 4628.9148836417. The cubic root of 21426853 is about 277.7491872026.

The spelling of 21426853 in words is "twenty-one million, four hundred twenty-six thousand, eight hundred fifty-three".