21064141 has 16 divisors (see below), whose sum is σ = 25590400. Its totient is φ = 16936128.

The previous prime is 21064133. The next prime is 21064163. The reversal of 21064141 is 14146012.

It is a cyclic number.

It is not a de Polignac number, because 21064141 - 2³ = 21064133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064181) 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, 13771 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (1599400).

Almost surely, 2^21064141 is an apocalyptic number.

It is an amenable number.

21064141 is a deficient number, since it is larger than the sum of its proper divisors (4526259).

21064141 is a wasteful number, since it uses less digits than its factorization.

21064141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21064141 is about 4589.5687161214. The cubic root of 21064141 is about 276.1730212819.

The spelling of 21064141 in words is "twenty-one million, sixty-four thousand, one hundred forty-one".