21349594 has 24 divisors (see below), whose sum is σ = 37559808. Its totient is φ = 9074520.

The previous prime is 21349591. The next prime is 21349621. The reversal of 21349594 is 49594312.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21349591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12007 + ... + 13669.

It is an arithmetic number, because the mean of its divisors is an integer number (1564992).

Almost surely, 2^21349594 is an apocalyptic number.

21349594 is a deficient number, since it is larger than the sum of its proper divisors (16210214).

21349594 is a wasteful number, since it uses less digits than its factorization.

21349594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810 (or 1803 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 21349594 is about 4620.5620870193. The cubic root of 21349594 is about 277.4149575729.

The spelling of 21349594 in words is "twenty-one million, three hundred forty-nine thousand, five hundred ninety-four".