21653046 has 24 divisors (see below), whose sum is σ = 49384920. Its totient is φ = 6837696.

The previous prime is 21653039. The next prime is 21653057. The reversal of 21653046 is 64035612.

21653046 is a `hidden beast` number, since 2 + 1 + 653 + 0 + 4 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31315 + ... + 31998.

It is an arithmetic number, because the mean of its divisors is an integer number (2057705).

Almost surely, 2^21653046 is an apocalyptic number.

21653046 is an abundant number, since it is smaller than the sum of its proper divisors (27731874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21653046 is a wasteful number, since it uses less digits than its factorization.

21653046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63340 (or 63337 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21653046 is about 4653.2833569427. The cubic root of 21653046 is about 278.7231230161.

Adding to 21653046 its reverse (64035612), we get a palindrome (85688658).

The spelling of 21653046 in words is "twenty-one million, six hundred fifty-three thousand, forty-six".