21067413 has 16 divisors (see below), whose sum is σ = 28687296. Its totient is φ = 13749120.

The previous prime is 21067391. The next prime is 21067433. The reversal of 21067413 is 31476012.

It is not a de Polignac number, because 21067413 - 2⁶ = 21067349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56295 + ... + 56667.

It is an arithmetic number, because the mean of its divisors is an integer number (1792956).

Almost surely, 2^21067413 is an apocalyptic number.

It is an amenable number.

21067413 is a deficient number, since it is larger than the sum of its proper divisors (7619883).

21067413 is a wasteful number, since it uses less digits than its factorization.

21067413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21067413 is about 4589.9251627886. The cubic root of 21067413 is about 276.1873203275.

The spelling of 21067413 in words is "twenty-one million, sixty-seven thousand, four hundred thirteen".