21274641 has 12 divisors (see below), whose sum is σ = 30790032. Its totient is φ = 14155416.

The previous prime is 21274639. The next prime is 21274651. The reversal of 21274641 is 14647212.

21274641 is a `hidden beast` number, since 2 + 12 + 7 + 4 + 641 = 666.

It is not a de Polignac number, because 21274641 - 2¹ = 21274639 is a prime.

It is a super-2 number, since 2×21274641² = 905220699357762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21274651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3270 + ... + 7296.

It is an arithmetic number, because the mean of its divisors is an integer number (2565836).

Almost surely, 2^21274641 is an apocalyptic number.

It is an amenable number.

21274641 is a deficient number, since it is larger than the sum of its proper divisors (9515391).

21274641 is a wasteful number, since it uses less digits than its factorization.

21274641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4620 (or 4617 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21274641 is about 4612.4441460033. Note that the first 3 decimals coincide. The cubic root of 21274641 is about 277.0899324387.

The spelling of 21274641 in words is "twenty-one million, two hundred seventy-four thousand, six hundred forty-one".