21014649 has 6 divisors (see below), whose sum is σ = 30354506. Its totient is φ = 14009760.

The previous prime is 21014641. The next prime is 21014657. The reversal of 21014649 is 94641012.

21014649 is a `hidden beast` number, since 2 + 1 + 0 + 14 + 649 = 666.

It is an interprime number because it is at equal distance from previous prime (21014641) and next prime (21014657).

It can be written as a sum of positive squares in only one way, i.e., 10517049 + 10497600 = 3243^2 + 3240^2 .

It is not a de Polignac number, because 21014649 - 2³ = 21014641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167472 + ... + 1167489.

Almost surely, 2^21014649 is an apocalyptic number.

It is an amenable number.

21014649 is a deficient number, since it is larger than the sum of its proper divisors (9339857).

21014649 is a wasteful number, since it uses less digits than its factorization.

21014649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334967 (or 2334964 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21014649 is about 4584.1737532515. The cubic root of 21014649 is about 275.9565542831.

The spelling of 21014649 in words is "twenty-one million, fourteen thousand, six hundred forty-nine".