21477694 has 8 divisors (see below), whose sum is σ = 36818928. Its totient is φ = 9204720.

The previous prime is 21477689. The next prime is 21477697. The reversal of 21477694 is 49677412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21477694² = 922582679115272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767047 + ... + 767074.

It is an arithmetic number, because the mean of its divisors is an integer number (4602366).

Almost surely, 2^21477694 is an apocalyptic number.

21477694 is a deficient number, since it is larger than the sum of its proper divisors (15341234).

21477694 is a wasteful number, since it uses less digits than its factorization.

21477694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534130.

The product of its digits is 84672, while the sum is 40.

The square root of 21477694 is about 4634.4033057126. The cubic root of 21477694 is about 277.9686920214.

The spelling of 21477694 in words is "twenty-one million, four hundred seventy-seven thousand, six hundred ninety-four".