21697054 has 8 divisors (see below), whose sum is σ = 32568480. Its totient is φ = 10840896.

The previous prime is 21697051. The next prime is 21697097. The reversal of 21697054 is 45079612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21697051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 907 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (4071060).

Almost surely, 2^21697054 is an apocalyptic number.

21697054 is a deficient number, since it is larger than the sum of its proper divisors (10871426).

21697054 is a wasteful number, since it uses less digits than its factorization.

21697054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7634.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21697054 is about 4658.0096607886. The cubic root of 21697054 is about 278.9118223591.

The spelling of 21697054 in words is "twenty-one million, six hundred ninety-seven thousand, fifty-four".