21047654 has 8 divisors (see below), whose sum is σ = 31971360. Its totient is φ = 10390536.

The previous prime is 21047647. The next prime is 21047657. The reversal of 21047654 is 45674012.

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 (21047657) 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, 66449 + ... + 66764.

It is an arithmetic number, because the mean of its divisors is an integer number (3996420).

Almost surely, 2^21047654 is an apocalyptic number.

21047654 is a deficient number, since it is larger than the sum of its proper divisors (10923706).

21047654 is a wasteful number, since it uses less digits than its factorization.

21047654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133294.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21047654 is about 4587.7722262554. The cubic root of 21047654 is about 276.1009485103.

The spelling of 21047654 in words is "twenty-one million, forty-seven thousand, six hundred fifty-four".