21041694 has 20 divisors (see below), whose sum is σ = 47149344. Its totient is φ = 7013844.

The previous prime is 21041677. The next prime is 21041707. The reversal of 21041694 is 49614012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64782 + ... + 65105.

Almost surely, 2^21041694 is an apocalyptic number.

21041694 is an abundant number, since it is smaller than the sum of its proper divisors (26107650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21041694 is a wasteful number, since it uses less digits than its factorization.

21041694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129901 (or 129892 counting only the distinct ones).

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

The square root of 21041694 is about 4587.1226275302. The cubic root of 21041694 is about 276.0748851621.

The spelling of 21041694 in words is "twenty-one million, forty-one thousand, six hundred ninety-four".