21442653 has 12 divisors (see below), whose sum is σ = 31093920. Its totient is φ = 14239176.

The previous prime is 21442649. The next prime is 21442657. The reversal of 21442653 is 35624412.

21442653 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 2 + 653 = 666.

It is an interprime number because it is at equal distance from previous prime (21442649) and next prime (21442657).

It is not a de Polignac number, because 21442653 - 2² = 21442649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2163 + ... + 6896.

It is an arithmetic number, because the mean of its divisors is an integer number (2591160).

Almost surely, 2^21442653 is an apocalyptic number.

It is an amenable number.

21442653 is a deficient number, since it is larger than the sum of its proper divisors (9651267).

21442653 is a wasteful number, since it uses less digits than its factorization.

21442653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9328 (or 9325 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21442653 is about 4630.6212326210. The cubic root of 21442653 is about 277.8174404816.

The spelling of 21442653 in words is "twenty-one million, four hundred forty-two thousand, six hundred fifty-three".