21594141 has 16 divisors (see below), whose sum is σ = 32123520. Its totient is φ = 14336640.

The previous prime is 21594137. The next prime is 21594149. The reversal of 21594141 is 14149512.

It is not a de Polignac number, because 21594141 - 2² = 21594137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21594149) 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, 5581 + ... + 8621.

It is an arithmetic number, because the mean of its divisors is an integer number (2007720).

Almost surely, 2^21594141 is an apocalyptic number.

It is an amenable number.

21594141 is a deficient number, since it is larger than the sum of its proper divisors (10529379).

21594141 is a wasteful number, since it uses less digits than its factorization.

21594141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3313 (or 3307 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 21594141 is about 4646.9496446594. The cubic root of 21594141 is about 278.4701471203.

The spelling of 21594141 in words is "twenty-one million, five hundred ninety-four thousand, one hundred forty-one".