21076641 has 12 divisors (see below), whose sum is σ = 30484480. Its totient is φ = 14032440.

The previous prime is 21076639. The next prime is 21076667. The reversal of 21076641 is 14667012.

21076641 is a `hidden beast` number, since 2 + 10 + 7 + 6 + 641 = 666.

It is not a de Polignac number, because 21076641 - 2¹ = 21076639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21076631) 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, 10596 + ... + 12426.

Almost surely, 2^21076641 is an apocalyptic number.

It is an amenable number.

21076641 is a deficient number, since it is larger than the sum of its proper divisors (9407839).

21076641 is a wasteful number, since it uses less digits than its factorization.

21076641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116 (or 3113 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21076641 is about 4590.9302978808. The cubic root of 21076641 is about 276.2276398574.

The spelling of 21076641 in words is "twenty-one million, seventy-six thousand, six hundred forty-one".